Problem 1.5. KINEMATICS | Learning to Solve Physics Problems from Scratch
If you've decided to learn how to solve physics problems from scratch, you've come to the right place. On my channel, I'll be covering a wide variety of problems in kinematics, dynamics, and other areas of physics, with very simple and accessible explanations of the solution algorithm.
I also plan to post tips and recommendations for schoolchildren and students who want to learn how to solve physics problems. So, if you have any questions about these problems or would like clarification on anything, please ask in the comments. If necessary, I'll record videos answering your questions.
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Problem 1.5
An airplane flies relative to the air at a speed of V0 = 800 km/h. The wind is blowing from west to east at a speed of U=15 m/s. At what speed will the plane move relative to the ground, and at what angle should it maintain its course to move:
a) south, b) north, c) west, d) east
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► DOWNLOAD A PHOTO OF MY PHYSICS NOTEBOOK:
(in the section) "Physics")
https://www.toe1.ru
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✅ Thank the channel's author:
4276510010822044 (Sberbank)
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It's important to remember that physics problems are essentially what surrounds us. These processes, actions, and mechanisms we encounter when solving a problem are all part of the world around us. When approaching a new problem, even the simplest one, try to recognize the phenomenon, visualize it (as a picture), discuss its process (if possible), and only then begin searching for an answer to the problem question.
You can formulate the problem as you imagined it:
a brief statement of the condition, which should reflect not only the given numerical values but also all additional conditions that follow from the problem text.
Illustrating the problem with a drawing: create a drawing for the problem that shows the situation described in the problem, include all the given conditions, and formulate the problem question.
A drawing is especially necessary if the equations used are given in vector form. In this case, you need to draw a coordinate system relative to which the vector equation should be written in projections. A drawing is also necessary if the body is moving or at an angle.
You need to check that all the given quantities in the problem are in the same system of units (SI, CGS, or others). If the quantities are given in different systems, they should be expressed in units of the system you've chosen for the solution. The SI system is preferred, but not always.
So, the problem statement is formulated; now you can begin solving it.
Consider the physical content of the problem, determine which section it belongs to, and what laws should be used. Problems can be combined; their solution requires the use of laws from several branches of physics. In problems in mechanics, the first question you usually ask yourself is: what is the nature of the motion?
-Next, write down the formulas corresponding to the laws used in the problem. Don't immediately look for the unknown quantity; you need to check that all the parameters in the formula are known. If the number of unknowns is greater than the number of equations, add the equations that follow from the statement and the figure. General principle: the number of unknowns equals the number of formulas. Then all that remains is to solve the system of equations, that is, to reduce the problem from a physical to a mathematical one. A common mistake: not fully understanding the meaning of the parameters in a formula. Schoolchildren are quite capable of solving a physics problem, but often get confused by their notation.
-Problems should usually be solved in general terms, that is, using letter notation.
-Having obtained a general solution, you need to check the dimensions of the resulting quantity. To do this, substitute the dimensions of the quantities involved in the formula, not the numbers. The answer must correspond to the dimensions of the desired quantity; this guarantees the correct solution. After checking the formula for dimensions, you should substitute the numerical values of the quantities involved and perform the calculation.
-Next, you need to analyze and formulate an answer. If the question was "how has..." changed, you should also indicate the direction of the change (increased, decreased, slowed, etc.).
And finally... I recommend solving physics problems regularly. Start solving problems daily, and after a while, you'll feel that you can solve each subsequent problem faster and with less effort. You'll learn to "see" them from the inside, even without a drawing. But this skill is developed only through regular practice. The ability to quickly solve problems will be useful not only for exams but also during university studies.
#KinematicsProblems #MechanicsKinematics #PhysicsFromScratch #PhysicsProblems