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Physics Problem Solving Secrets: 120 Must-Know Problems Solved Step-By-Step Paperback – December 25, 2011
How much is passing physics class worth to getting your degree? Suppose you could spend one night reading and afterward be able to solve any textbook physics problem. Imagine ... spend LESS time studying yet receive BETTER grades on your homework and exams.
Well, it isn't if you have the right teaching method.
Think about it. Solving textbook problems is the most important skill you need to get through class. Everything in class centers on this. You can waste a LOT of time memorizing formulas and various problem solving "methods" without ever getting to that "Aha!" moment. Truthfully, solving textbook problems is the FIRST step in understanding physics, but most professors can't even teach that after a whole year!
Simply put, learning to solve these homework problems is the key to getting an A in class.
At last! The RIGHT way to learn physics is here.
Which of These Powerful Secrets Are You Looking For?
- The most important rule for calculating the components of vectors.
- How to get projectile problems right, every time.
- Energy and entropy explained in a way anyone can understand.
- When, where, and how to use trigonometry without losing your mind.
- Step-by-step method to solve static rigid body problems.
- Special relativity explained using the "twin paradox".
- The single pivotal principle behind quantum mechanics.
- Why quarks and electrons are the building blocks of the universe.
- The relationship between electricity, magnetism, and light.
... plus lots more!
Included are 120 typical homework problems solved STEP-BY-STEP. There are no "details left to the reader" here. Each problem begins with an explanation of how and why a particular approach or equation is used, then each step is explained from beginning to end.
I love this subject. It's is my passion. And as with anything loved, I HATE to see or hear my subject butchered by the average high-school and college "systems". This subject ought to be FUN! Unfortunately, you can't see than until you can SOLVE THE PROBLEMS.
Have you ever wondered why geniuses like Einstein or Feynman ENJOYED physics? I want to help you with the first step in understanding (problem solving), so you can get a glimmer of why. That's my primary motive.
But there is another. I don't want physics to get in your way. If you just want a way through the college "system", I think that's okay. Really. Not everyone needs to be a rocket scientist. In fact, that's kind of silly when you think about it. I just want to help.
It's easy to get started right away.
Get ready to enjoy more free time and still ACE that physics class!
- Print length 272 pages
- Language English
- Publication date December 25, 2011
- Dimensions 5.25 x 0.68 x 8 inches
- ISBN-10 1463798652
- ISBN-13 978-1463798659
- See all details
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- #10,955 in Decision-Making & Problem Solving
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Physics Problem Solving Secrets: 120 Must-Know Problems Solved Step-By-Step Paperback – 25 Dec. 2011
How much is passing physics class worth to getting your degree? Suppose you could spend one night reading and afterward be able to solve any textbook physics problem. Imagine ... spend LESS time studying yet receive BETTER grades on your homework and exams.
Well, it isn't if you have the right teaching method.
Think about it. Solving textbook problems is the most important skill you need to get through class. Everything in class centers on this. You can waste a LOT of time memorizing formulas and various problem solving "methods" without ever getting to that "Aha!" moment. Truthfully, solving textbook problems is the FIRST step in understanding physics, but most professors can't even teach that after a whole year!
Simply put, learning to solve these homework problems is the key to getting an A in class.
At last! The RIGHT way to learn physics is here.
Which of These Powerful Secrets Are You Looking For?
- The most important rule for calculating the components of vectors.
- How to get projectile problems right, every time.
- Energy and entropy explained in a way anyone can understand.
- When, where, and how to use trigonometry without losing your mind.
- Step-by-step method to solve static rigid body problems.
- Special relativity explained using the "twin paradox".
- The single pivotal principle behind quantum mechanics.
- Why quarks and electrons are the building blocks of the universe.
- The relationship between electricity, magnetism, and light.
... plus lots more!
Included are 120 typical homework problems solved STEP-BY-STEP. There are no "details left to the reader" here. Each problem begins with an explanation of how and why a particular approach or equation is used, then each step is explained from beginning to end.
I love this subject. It's is my passion. And as with anything loved, I HATE to see or hear my subject butchered by the average high-school and college "systems". This subject ought to be FUN! Unfortunately, you can't see than until you can SOLVE THE PROBLEMS.
Have you ever wondered why geniuses like Einstein or Feynman ENJOYED physics? I want to help you with the first step in understanding (problem solving), so you can get a glimmer of why. That's my primary motive.
But there is another. I don't want physics to get in your way. If you just want a way through the college "system", I think that's okay. Really. Not everyone needs to be a rocket scientist. In fact, that's kind of silly when you think about it. I just want to help.
It's easy to get started right away.
Get ready to enjoy more free time and still ACE that physics class!
- Print length 272 pages
- Language English
- Publication date 25 Dec. 2011
- Dimensions 13.34 x 1.73 x 20.32 cm
- ISBN-10 1463798652
- ISBN-13 978-1463798659
- See all details
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Mastering Physics Problem-Solving: A Comprehensive 6-Step Guide
Introduction.
Physics problems can often be daunting, but with a systematic approach, they become manageable challenges. In this guide, we will explore a detailed six-step process designed to enhance your problem-solving skills. Whether you are a student navigating your physics coursework or a physics enthusiast delving into complex scenarios, these steps will provide a solid foundation for tackling any physics problem effectively.
1. Commence with a Clear and Comprehensive Diagram
The importance of visualization in physics cannot be overstated. To kickstart your problem-solving journey, begin by drawing a clear and comprehensive diagram. This visual representation serves as a roadmap, aiding in the understanding of the problem’s intricacies. It enables you to decipher the given information and conceptualize the scenario, providing a tangible foundation for the subsequent steps.
Consider a scenario where you are tasked with understanding the motion of objects in a gravitational field. A well-drawn diagram could depict the initial and final positions, velocities, and any forces at play. This step ensures that you have a tangible representation of the problem, helping to organize your thoughts and set the stage for a systematic solution.
2. Systematically Transfer Data to the Diagram
With the diagram in place, the next step involves systematically transferring all pertinent data and information onto it. This process serves a dual purpose – it helps you internalize the details of the problem, and it minimizes the need to revisit the question repeatedly during the solution phase. Efficiently transferring information ensures that you have a clear reference point for the specifics of the given scenario.
For instance, if dealing with a dynamics problem involving multiple forces, annotate the magnitudes, directions, and points of application directly on the diagram. This step ensures that you have a consolidated source of information, reducing the chances of overlooking critical details during the subsequent stages of problem-solving.
3. Identify Relevant Concepts
Physics problems often encompass various concepts and principles. Identifying the relevant ones is crucial for crafting a targeted solution. As you examine the given problem, consider the fundamental physics principles at play. This step requires a solid understanding of the underlying theories and laws applicable to the specific scenario.
Continuing with the example of objects in a gravitational field, you would identify concepts such as Newton’s laws of motion and the principles of gravitational acceleration. Recognizing these fundamental ideas guides the subsequent steps, providing a conceptual framework for deriving and applying the necessary equations.
4. Establish Correct Equations
Once you have a conceptual framework in place, the next step involves establishing the correct equations. At this stage, resist the temptation to substitute numerical values. Instead, focus on the relationships between the physical quantities involved. Derive or identify the equations that encapsulate the principles relevant to the given scenario.
For our gravitational field example, this step might involve recognizing the kinematic equations related to the motion of objects under constant acceleration. Establishing these equations sets the stage for a more structured and conceptual solution, laying the groundwork for the subsequent numerical analysis.
5. Integrate Numerical Values into Simplified Equations
With the equations identified, it’s time to introduce numerical values. Before doing so, ensure that the units across all quantities are consistent. If necessary, convert units to the International System of Units (SI) for uniformity. This step is crucial for maintaining precision throughout the solution process.
Consider a scenario where time is initially given in minutes, but the chosen equation requires seconds. Converting units beforehand prevents errors and ensures that the subsequent calculations are accurate. This meticulous approach contributes to the overall accuracy and reliability of the solution.
6. Present the Final Answer with Precision
The final step in this comprehensive guide involves presenting the solution with precision. State the numerical answer with the appropriate number of significant figures or decimal places, accompanied by the correct unit. This attention to detail is essential for conveying the accuracy of your solution and aligning with the standards of scientific reporting.
In our gravitational field example, if the calculated displacement is expressed as 25.678 meters, the final answer should be presented with the appropriate precision – perhaps as 25.7 meters or 2.57 x 10^1 meters, depending on the context and significant figures involved.
Mastering physics problem-solving is a journey that involves a combination of visualization, systematic data organization, conceptual understanding, and precision in numerical analysis. By following this six-step guide, you can navigate through complex physics scenarios with confidence, developing a robust problem-solving skill set that is applicable across various physics disciplines. Embrace the challenge, cultivate a disciplined approach, and watch as your proficiency in solving physics problems reaches new heights.
Back To A Level Physics Topic List
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How to Solve Any Physics Problem
Last Updated: July 21, 2023 Fact Checked
This article was co-authored by Sean Alexander, MS . Sean Alexander is an Academic Tutor specializing in teaching mathematics and physics. Sean is the Owner of Alexander Tutoring, an academic tutoring business that provides personalized studying sessions focused on mathematics and physics. With over 15 years of experience, Sean has worked as a physics and math instructor and tutor for Stanford University, San Francisco State University, and Stanbridge Academy. He holds a BS in Physics from the University of California, Santa Barbara and an MS in Theoretical Physics from San Francisco State University. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 330,714 times.
Baffled as to where to begin with a physics problem? There is a very simply and logical flow process to solving any physics problem.
- Ask yourself if your answers make sense. If the numbers look absurd (for example, you get that a rock dropped off a 50-meter cliff moves with the speed of only 0.00965 meters per second when it hits the ground), you made a mistake somewhere.
- Don't forget to include the units into your answers, and always keep track of them. So, if you are solving for velocity and get your answer in seconds, that is a sign that something went wrong, because it should be in meters per second.
- Plug your answers back into the original equations to make sure you get the same number on both sides.
Community Q&A
- Many people report that if they leave a problem for a while and come back to it later, they find they have a new perspective on it and can sometimes see an easy way to the answer that they did not notice before. Thanks Helpful 249 Not Helpful 48
- Try to understand the problem first. Thanks Helpful 186 Not Helpful 51
- Remember, the physics part of the problem is figuring out what you are solving for, drawing the diagram, and remembering the formulae. The rest is just use of algebra, trigonometry, and/or calculus, depending on the difficulty of your course. Thanks Helpful 115 Not Helpful 34
- Physics is not easy to grasp for many people, so do not get bent out of shape over a problem. Thanks Helpful 100 Not Helpful 25
- If an instructor tells you to draw a free body diagram, be sure that that is exactly what you draw. Thanks Helpful 89 Not Helpful 24
Things You'll Need
- A Writing Utensil (preferably a pencil or erasable pen of sorts)
- Calculator with all the functions you need for your exam
- An understanding of the equations needed to solve the problems. Or a list of them will suffice if you are just trying to get through the course alive.
You Might Also Like
Expert Interview
Thanks for reading our article! If you’d like to learn more about teaching, check out our in-depth interview with Sean Alexander, MS .
- ↑ https://iopscience.iop.org/article/10.1088/1361-6404/aa9038
- ↑ https://physics.wvu.edu/files/d/ce78505d-1426-4d68-8bb2-128d8aac6b1b/expertapproachtosolvingphysicsproblems.pdf
- ↑ https://www.brighthubeducation.com/science-homework-help/42596-tips-to-choosing-the-correct-physics-formula/
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The secret to becoming an excellent physicist
- When most people think of a great physicist, they think of Einstein, often alongside his famous quote, “Imagination is more important than knowledge.”
- Professional physicists, armchair physicists, and laypersons alike all have wild, imaginative ideas concerning how the world works, but very few ideas are worth serious scrutiny.
- This isn’t because of bias, gatekeepting, close-mindedness, or dogmatism. It’s because the expertise you gain in becoming a quality physicist teaches you how to separate out the nonsense.
All across the world, young adults are working hard toward making their dreams a reality. For many students at both the undergraduate and graduate levels, that dream involves unlocking the secrets of the Universe, taking us beyond our current understanding and beyond the Standard Models of both particle physics and cosmology. For generations, aspirational students have dreamed about becoming the next Heisenberg, Bohr, Dirac, Einstein, or even Newton, believing that they might have, inside their minds, the “secret sauce,” whatever it may be, to lead the next revolution in physics.
Most of them, unfortunately, wind up doing nothing of the sort. Revolutions in physics are extraordinarily hard to initiate, and for good reason: after centuries of theoretical and experimental work by thousands upon thousands of brilliant, competent minds, the current consensus models are strong and sturdy enough that they’re extraordinarily difficult to equal in terms of success, much less surpass. While numerous ideas abound, the critical evidence that would support any of them is sorely lacking. At the frontiers of physics, we’re all still stabbing in the dark.
But while the excellent physicists doing the stabbing are doing so with the equivalent of sharp knives, others have the equivalent of nerf bats, and don’t even realize the difference. In most cases, it’s because they never learned the secret to becoming an excellent physicist. Here’s the lesson they need to learn.
When most people think about breakthroughs in physics, they think about truly revolutionary ideas. They think about Einstein and his ideas — or thought experiments — that no one had conceived of before him.
- They think about Einstein’s notion of “riding a light wave,” and what it would look like to see oscillating, in-phase electric and magnetic fields appearing and disappearing with a specific amplitude, and how no such phenomena exists: the thought-experiment that led him to the principle of relativity and the constancy of the speed of light.
- They think about the notion that, as objects move at speeds that take them closer to the speed of light, their kinetic energy increases dependent on your frame of reference, but in all frames of reference, a specific portion of that energy remains the same: enabling Einstein to derive the idea of a rest-mass energy and his most famous equation : E = mc² .
- And they think about what Einstein himself called “his happiest thought,” or the notion that, from inside a closed room, you cannot tell whether you’re experiencing the downward pull of gravitation or the equal-and-opposite reaction from a constant thrust, or acceleration. This thought led to Einstein’s equivalence principle, which in turn eventually gave rise to Einstein’s General theory of Relativity .
It’s almost as if one person, even coming from outside the mainstream school of scientific thought, could almost single-handedly overturn the leading ideas in a modern scientific field and herald a revolution that leads us to a radical reconception of how the Universe works. Einstein himself seemed to agree with this notion, as you can find his famous quote, “Imagination is more important than knowledge,” practically anywhere you look.
But this fails to recognize the true extent of the background work that was necessary for Einstein to undertake, on his own, before any of these revolutionary thoughts could even begin to enter his head. It ignores the fact that Einstein went to school, learned physics, and even studied under one of the great mathematicians and physicists of his time: Hermann Minkowski. It ignores the fact that Einstein himself, even after leaving school, formed his own academy to study physics wherein he and his collaborators worked through the intricacies and consequences of various avenues of thought.
And it even ignores the context of Einstein’s full quote , which states ,
“I am enough of an artist to draw freely upon my imagination. Imagination is more important than knowledge. For knowledge is limited, whereas imagination encircles the world.”
The key that most people miss about Einstein’s quote is that a certain level of knowledge — a level that eludes most people who don’t spend the necessary time and energy in gaining it — is required, as a prerequisite, to fully understand what our modern conception of the Universe is and isn’t successful at doing. That knowledge, of course, won’t lead you to any remarkable new insights on its own; for that, imagination is required as well, but it’s imagination that’s informed by a comprehensive foundational knowledge of where we are today and how we came to know the things that we actually meaningfully know.
Imagination is more important than knowledge as far as making novel advances go, in the sense that if you have two equivalent minds with equal knowledge of physics, but one is wildly imaginative and the other only limits their thoughts to what our current understanding has already revealed to us, the imaginative one is far more likely to blaze a revolutionary path forward than the one who has restricted their imagination. Great, novel ideas very rarely emerge from taking what is known and extrapolating to the next, minimally imaginative logical step. Imagination is required, and there’s no substitute for that key ingredient.
But while imagination is desirable for coming up with revolutionary ideas, a foundational knowledge of the physical theories and ideas that have led us to our current scientific consensus is absolutely mandatory. Many students — prior to beginning their undergraduate degree, while in pursuit of their bachelor’s degree, when considering graduate schools, or while a graduate student themselves — underestimate the importance of obtaining that knowledge, overestimate their reliance on their (not fully formed) physical intuition, and fail to recognize the critical step required to become an excellent physicist.
That key step?
It’s simplicity itself: you become good at physics by solving physics problems . That’s it: that’s the secret. If you want to become competent at physics, you will solve physics problems in the area you wish to learn.
Want to learn classical mechanics? Learn how to formulate the setup for a problem, write down the equations that describe the problem, work through the steps of solving those equations to arrive at physically relevant solutions, and use those solutions to work out the expected behavior of the system you’re considering.
Want to learn electromagnetism? Same thing: learn how to identify your knowns and unknowns, how to relate them through a series of equations and boundary conditions, how to solve that system of equations, and how to extract measurable and observable quantities that reveal your predicted answer.
It’s the same story with quantum mechanics, nuclear and particle physics, astrophysics, cosmology, geophysics, or any other physical system you dare to consider. You learn physics by solving problems; only through that specific avenue of exploring what physical consequences arise under certain specific conditions can you develop the intuition necessary to bring about an understanding of the kinds of physical systems you want to consider. This is true both experimentally and theoretically, as both classes of physics necessitate their own set of expertise and their own unique set of experiences in gaining it.
If you want to learn how to be a good swimmer, get in the water and swim. If you want to learn how to paint, get out the brushes and canvas and paint. If you want to learn how to play the piano, sit down in front of a piano and start playing those keys. And if you want to learn how to do physics, break out the problem sets or the experimental apparatuses and start solving physics problems.
That’s it. That’s the big secret: if you want to become competent at physics, you have to take on physics problems and become adept with the tools and techniques needed to solve them. In the history of physics, this has been a hallmark of absolutely everyone who’s made a meaningful contribution: either experimentally or theoretically or at the intersection of both. Without sufficient experience at problem solving, you simply cannot become a competent physicist, as only through the act of solving those key problems will you develop the necessary skills to become competent at this endeavor at all.
We all have gifts and talents, but one of the rude awakenings that many physics students receive at some point along their educational journey is that no matter your gifts and talents, there is no substitute for the development of necessary skills. Problem solving is something you can be talented at, for certain, but we all need practice at solving those problems in order to gain a competence and a familiarity — and to eventually develop an intuition that doesn’t lead you astray — when it comes to any particular area of physics. If you don’t put in that specific type of work, you’ll never develop the most important aspect of becoming good at physics: understanding the quantitative relationship between different physical phenomena and effects.
A lot of students are mystified at hearing this seemingly obvious advice, thinking they’re already following it as directed by attempting the assigned homework. Although you get partial credit for that, the main advice — you become good at physics by solving physics problems — has an important corollary: you need to learn a greater amount of physics than the physics you’d encounter simply from going through your assigned homework.
You need to learn the physics in your physics textbook, for example. Most students believe, erroneously, that if you read the textbook and refer to various sections of it, as needed, while solving your homework problems, that’s sufficient. Instead, I’d recommend the following course of action instead.
- Read the relevant section of the book before attending the lecture that will cover the material in the book, including taking notes and writing down the equations that appear.
- When you go to your lecture, take notes on everything the instructor writes down, including anything they say that you find relevant/interesting that they don’t write down.
- After your lecture — and before doing your homework — go through the relevant section of your book along with your lecture notes, and this time make sure you can step-by-step work through every problem that was solved and/or worked out in the lecture and in the relevant section of the book.
- And then, only then, after you’ve done all of that, should you go and do your homework.
If that sounds like a lot of work to put in, I’d encourage you to ask yourself this question: what do you hope to get out of an education in physics? Because all you’ll ever get out is directly proportional to the work you put in. The more time you spend with the equations, setting them up correctly under a variety of physical conditions, solving the relevant system of equations to find the unknown quantities based on what you can know/measure, and then comparing those predictions with something that’s measurable, the more capable you’ll be of correctly and usefully modeling a novel, newly considered system.
There are lots of other activities, many of which are worth the time and investment of effort, that can help you improve at physics in addition to setting up and solving relevant sets of problems.
- You can read books, including in-depth and popular accounts of various topics, often going back to the original sources where the idea you’re interested in was first put forth.
- You can read review papers and conference proceedings, which typically offer a broader, more modern, more accessible overview of a new field than a textbook or original source can.
- You can work through specialized textbooks, particularly ones that guide you through the equations relevant to the problems you’re considering.
But, once again, if you don’t work out the quantitative parts for yourself, you’re short-changing yourself on an intellectually fundamental level.
As a physicist, you’ll often receive solicitations from people who say things like, “I have an idea, I just need someone to help me with the math/details.” But unless you’re someone who’s worked through the quantitative details found in a variety of physical systems for yourself — likely correcting a vast array of misconceptions that you previously had before learning the lessons one learns by doing precisely that hard, quantitative work — you have no way of evaluating whether your idea even makes sense, much less if it has any merits.
You learn physics by solving problems, and by extension, if you haven’t solved the relevant problems, you almost certainly haven’t learned enough physics to be able to evaluate an idea in any sort of meaningful way. A huge part of learning physics involves disabusing yourself of notions that you possessed before you learned the valuable lessons one can only learn by doing that difficult, necessary, quantitative work to see which effects matter, and by how much, under a variety of circumstances. Imagination may be more important than knowledge, but a foundational level of knowledge is absolutely required for your imaginative thoughts to be relevant to the Universe at hand. You learn physics by solving problems, and that’s the secret key to achieving excellence in this particular scientific field.
4 tricks for solving any physics problem
Physics can be intimidating—all those pulleys and protons and projectile motion. If you approach it with the right mindset, however, even the hardest problems are usually easier than you think. When you come up against a tough question, don’t panic. Instead, start with these short, easy tricks to help you work through the problem.
4 tricks for solving any physics problem:
1. what is the subject.
Just about every physics question is testing specific knowledge. When you read the question ask yourself, is it exploring electricity? Torque? Parabolic motion? Each topic is associated with specific equations and approaches, so recognizing the subject will focus your effort in the right direction. Look for keywords and phrases that reveal the topic.
2. What are you trying to find?
This simple step can save a lot of time. Before starting to solve the problem, think about what the answer will look like. What are the units; is the final answer going to be in kilograms or liters? Also, consider what other physical quantities might relate to your answer. If you’re trying to find speed, it might be useful to find acceleration, then solve that for speed. Determining restrictions on the answer early also ensures you answer the specific question; a common mistake in physics is solving for the wrong thing.
3. What do you know?
Think about what details the problem mentions. Unless the question is really bad, they probably gave you exactly the information you need to solve the problem. Don’t be surprised if sometimes this information is coded in language; a problem that mentions a spring with “the mass removed from the end” is telling you something important about the quantities of force. Write down every quantity you know from the problem, then proceed to…
4. What equations can you use?
What equations include the quantities you know and also the one you’re looking for? If you have the mass of an object and a force and you’re trying to find the acceleration, start with F=ma (Newton’s second law). If you’re trying to find the electric field but you have the charge and the distance, try E=q/(4πε*r 2 ).
If you’re having trouble figuring out which equation to use, go back to our first trick. What equations are associated with the topic? Can you manipulate the quantities you have to fit in any of them?
Bonus Trick: “hack” the units
This trick doesn’t always work but it can jumpstart your brain. First, determine the units of the quantity you’re trying to find and the quantities you have. Only use base units (meters, kilograms, seconds, charge), not compound units (Force is measured in Newtons, which are just kg*m/s 2 ). Multiply and divide the quantities until the units match the units of the answer quantity. For example, if you’re trying to find Potential Energy (kg*m 2 /s 2 ) and you have the height (m), mass (kg), and gravitational acceleration (m/s 2 ), you can match the units by multiplying the three quantities (m*kg*m/s 2 =kg*m 2 /s 2 ).
Note: Unlike the other ones, this trick won’t always work. Watch out for unitless constants. For example, Kinetic energy is ½*mass*velocity 2 , not just mass*velocity 2 as the units suggest. Even though this trick isn’t perfect, however, it can still be a great place to start.
Related Content
1.7 Solving Problems in Physics
Learning objectives.
By the end of this section, you will be able to:
- Describe the process for developing a problem-solving strategy.
- Explain how to find the numerical solution to a problem.
- Summarize the process for assessing the significance of the numerical solution to a problem.
Problem-solving skills are clearly essential to success in a quantitative course in physics. More important, the ability to apply broad physical principles—usually represented by equations—to specific situations is a very powerful form of knowledge. It is much more powerful than memorizing a list of facts. Analytical skills and problem-solving abilities can be applied to new situations whereas a list of facts cannot be made long enough to contain every possible circumstance. Such analytical skills are useful both for solving problems in this text and for applying physics in everyday life.
As you are probably well aware, a certain amount of creativity and insight is required to solve problems. No rigid procedure works every time. Creativity and insight grow with experience. With practice, the basics of problem solving become almost automatic. One way to get practice is to work out the text’s examples for yourself as you read. Another is to work as many end-of-section problems as possible, starting with the easiest to build confidence and then progressing to the more difficult. After you become involved in physics, you will see it all around you, and you can begin to apply it to situations you encounter outside the classroom, just as is done in many of the applications in this text.
Although there is no simple step-by-step method that works for every problem, the following three-stage process facilitates problem solving and makes it more meaningful. The three stages are strategy, solution, and significance. This process is used in examples throughout the book. Here, we look at each stage of the process in turn.
Strategy is the beginning stage of solving a problem. The idea is to figure out exactly what the problem is and then develop a strategy for solving it. Some general advice for this stage is as follows:
- Examine the situation to determine which physical principles are involved . It often helps to draw a simple sketch at the outset. You often need to decide which direction is positive and note that on your sketch. When you have identified the physical principles, it is much easier to find and apply the equations representing those principles. Although finding the correct equation is essential, keep in mind that equations represent physical principles, laws of nature, and relationships among physical quantities. Without a conceptual understanding of a problem, a numerical solution is meaningless.
- Make a list of what is given or can be inferred from the problem as stated (identify the “knowns”) . Many problems are stated very succinctly and require some inspection to determine what is known. Drawing a sketch can be very useful at this point as well. Formally identifying the knowns is of particular importance in applying physics to real-world situations. For example, the word stopped means the velocity is zero at that instant. Also, we can often take initial time and position as zero by the appropriate choice of coordinate system.
- Identify exactly what needs to be determined in the problem (identify the unknowns) . In complex problems, especially, it is not always obvious what needs to be found or in what sequence. Making a list can help identify the unknowns.
- Determine which physical principles can help you solve the problem . Since physical principles tend to be expressed in the form of mathematical equations, a list of knowns and unknowns can help here. It is easiest if you can find equations that contain only one unknown—that is, all the other variables are known—so you can solve for the unknown easily. If the equation contains more than one unknown, then additional equations are needed to solve the problem. In some problems, several unknowns must be determined to get at the one needed most. In such problems it is especially important to keep physical principles in mind to avoid going astray in a sea of equations. You may have to use two (or more) different equations to get the final answer.
The solution stage is when you do the math. Substitute the knowns (along with their units) into the appropriate equation and obtain numerical solutions complete with units . That is, do the algebra, calculus, geometry, or arithmetic necessary to find the unknown from the knowns, being sure to carry the units through the calculations. This step is clearly important because it produces the numerical answer, along with its units. Notice, however, that this stage is only one-third of the overall problem-solving process.
Significance
After having done the math in the solution stage of problem solving, it is tempting to think you are done. But, always remember that physics is not math. Rather, in doing physics, we use mathematics as a tool to help us understand nature. So, after you obtain a numerical answer, you should always assess its significance:
- Check your units. If the units of the answer are incorrect, then an error has been made and you should go back over your previous steps to find it. One way to find the mistake is to check all the equations you derived for dimensional consistency. However, be warned that correct units do not guarantee the numerical part of the answer is also correct.
- Check the answer to see whether it is reasonable. Does it make sense? This step is extremely important: –the goal of physics is to describe nature accurately. To determine whether the answer is reasonable, check both its magnitude and its sign, in addition to its units. The magnitude should be consistent with a rough estimate of what it should be. It should also compare reasonably with magnitudes of other quantities of the same type. The sign usually tells you about direction and should be consistent with your prior expectations. Your judgment will improve as you solve more physics problems, and it will become possible for you to make finer judgments regarding whether nature is described adequately by the answer to a problem. This step brings the problem back to its conceptual meaning. If you can judge whether the answer is reasonable, you have a deeper understanding of physics than just being able to solve a problem mechanically.
- Check to see whether the answer tells you something interesting. What does it mean? This is the flip side of the question: Does it make sense? Ultimately, physics is about understanding nature, and we solve physics problems to learn a little something about how nature operates. Therefore, assuming the answer does make sense, you should always take a moment to see if it tells you something about the world that you find interesting. Even if the answer to this particular problem is not very interesting to you, what about the method you used to solve it? Could the method be adapted to answer a question that you do find interesting? In many ways, it is in answering questions such as these that science progresses.
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Physics Wizard: 4 Secrets To Ace Problem-Solving In Exams
There’s no denying that Physics is a challenging and complicated field to study. All those theories, laws, and concepts need to be understood - not to mention the countless formulas that need to be solved and the detailed mathematical understanding and skills required! Problem-solving never goes out of the picture, too! If you are struggling with solving Physics problems, there are some tips that you can try!
Physics is a challenging course to tackle, and many students struggle when presented with a Physics problem. As difficult as it may seem, approaching it with the right mindset and practice, even the most confusing issues magically, seems more straightforward than you think! When you face a challenging or short Physics problem, don’t panic! Take a deep breath and follow these five techniques to help you solve the problem.
Understand what the topic is about
Every question in your exam is designed to test your knowledge of specific topics. Read the question carefully and understand what the question about is. Is it about heat and temperature? Forces and motion? Or perhaps about momentum? Each topic consists of specific terms, equations, and approaches, so understanding what the issue is about can help you narrow down the possible formulas to use to find the answer!
Figure out what the problem is looking for
After understanding the topic, it’s easy to get excited and quickly write down the formula used and start solving! However, this simple step can often lead to careless mistakes, especially the calculations. To avoid that, make sure to read the problem slowly and write down what you are looking for. In addition, take note of the unit of measurement used before tackling the problem!
List down familiar terms
Sometimes, you may encounter a problem that will leave you feeling lost even after days of studying for the exam. When this happens, the first thing you should do is list down which terms in the physics problem are familiar to you. Often, the question will already have the exact information that you need to identify and solve the problem.
Solve by using the correct equation/s
It is not surprising that you will likely encounter multiple calculation questions during your Physics exam. Next to understanding the problem, knowing which equation/s to use and applying them correctly is essential to get the final answer and pass your exam. So, whenever you encounter a calculation question, start by listing down the equations you know and determine which one(s) are useful in solving the problem.
For example, if you have the constant speed (v) of an object and the time (t) over which the motion occurred is given too, use the formula s = vt if you’re trying to find the displacement. But if you have the acceleration (a) and you’re trying to solve the velocity, use v = u + at.
Seek help for complicated topics
There will be times when you’ll encounter topics that are far too difficult to understand or solve on your own. In such cases, it’s wise to seek help from someone knowledgeable in the subject to guide with high-quality instruction. Enrolling in physics tuition is the most efficient way to get the help you need! The passionate and experienced tutors can help you understand the topics you need help with.
It’s common for students to struggle in Physics, especially the problem-solving part and for students transitioning to a higher level. As such, if you find yourself struggling with the course, rest assured that you are not alone! With practice and proper guidance from jc physics tuition , you’ll find yourself acing this subject in no time!
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Check Your Understanding
Answer: d = 1720 m
Answer: a = 8.10 m/s/s
Answers: d = 33.1 m and v f = 25.5 m/s
Answers: a = 11.2 m/s/s and d = 79.8 m
Answer: t = 1.29 s
Answers: a = 243 m/s/s
Answer: a = 0.712 m/s/s
Answer: d = 704 m
Answer: d = 28.6 m
Answer: v i = 7.17 m/s
Answer: v i = 5.03 m/s and hang time = 1.03 s (except for in sports commericals)
Answer: a = 1.62*10 5 m/s/s
Answer: d = 48.0 m
Answer: t = 8.69 s
Answer: a = -1.08*10^6 m/s/s
Answer: d = -57.0 m (57.0 meters deep)
Answer: v i = 47.6 m/s
Answer: a = 2.86 m/s/s and t = 30. 8 s
Answer: a = 15.8 m/s/s
Answer: v i = 94.4 mi/hr
Solutions to Above Problems
d = (0 m/s)*(32.8 s)+ 0.5*(3.20 m/s 2 )*(32.8 s) 2 Return to Problem 1
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This collection of physics problems solutions does not intend to cover the whole Introductory Physics course. Its purpose is to show the right way to solve physics problems. Here some useful tips. 1. Always try to find out what a problem is about, which part of the physics course is in question 2. Drawings are very helpful in most cases.
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Problem-solving skills are clearly essential to success in a quantitative course in physics. More important, the ability to apply broad physical principles—usually represented by equations—to specific situations is a very powerful form of knowledge. It is much more powerful than memorizing a list of facts.
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A useful problem-solving strategy was presented for use with these equations and two examples were given that illustrated the use of the strategy. Then, the application of the kinematic equations and the problem-solving strategy to free-fall motion was discussed and illustrated. In this part of Lesson 6, several sample problems will be presented.
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Quantum annealing (QA) is a method for solving combinatorial optimization problems. We can estimate the computational time for QA using what is referred to as the adiabatic condition derived from the adiabatic theorem. The adiabatic condition consists of two parts: an energy gap and a transition matrix. Most past studies have focused on the relationship between the energy gap and computational ...
One of the holy grails of physics has long been to link gravity with quantum mechanics, but that problem remains unsolved. In any quantum theory of gravity, we'd expect certain single indivisible ...
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