Problem 1.3. 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 solving a wide variety of problems in kinematics, dynamics, and other areas of physics, with a very simple and accessible explanation of the solution algorithm. I think almost anyone will understand it.
On this channel, I plan to post solutions, tips, and recommendations for schoolchildren and students who want to learn how to solve physics problems. So, if you have any questions about my problems or would like clarification on anything, please ask in the comments. I'll record videos answering your questions if needed. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
► Problem 1.3
A steamboat travels along a river from point A to point B at a speed of V1 = 10 km/h, and back at a speed of V2 = 16 km/h. Find the average speed of the steamboat and the average speed of the current of the I River.
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► DOWNLOAD A PHOTO OF MY PHYSICS NOTEBOOK:
(in the "Physics" section)
https://www.toe1.ru
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✅ Thank the author Channel:
4276510010822044 (Sberbank)
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It's important to remember that physics problems, at their core, are about what surrounds us. The processes, actions, and mechanisms we encounter when solving a particular problem—all of this constitutes the world around us. When approaching a problem, even the simplest one, try to recognize the phenomenon, visualize it (as a picture), discuss its process, and only then begin searching for an answer to the problem's question.
You can format the problem as you imagined it:
a brief statement of the problem, which should reflect not only the given numerical values but also all additional conditions that follow from the problem text.
formatting the problem as a drawing: create a drawing for the problem that shows the situation described in the problem, include all the given conditions of the problem, 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. In most cases, a drawing greatly facilitates the process of solving any problem, not just in physics. 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 unit system (SI, CGS, and others). If the quantities are given in different systems, they should be expressed in units of the system you are using for the solution. The SI system is preferred, but not always.
Now that the problem statement is written, you can begin solving it. We consider the physical content of the problem, determine which section it pertains to, and which laws must be used. Problems can be combined; their solution requires the use of laws from several branches of physics. In mechanics problems, the first question to ask is usually: what is the nature of the motion?
Next, we write down the formulas corresponding to the laws used in the problem. Don't immediately look for the unknown quantity; we need to check whether all the parameters in the formula are known. If the number of unknowns is greater than the number of equations, we need to add the equations that follow from the conditions and the diagram. The general principle is: there should be as many formulas as there are unknowns. 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: an incomplete understanding of the meaning of the parameters in the formula. Schoolchildren are quite capable of solving a physics problem, but often get confused in their notation.
The solution to the problem should most often be presented in general form, that is, using letter notation.
Having obtained the solution in general form, we 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 match the dimensions of the desired quantity; this guarantees the correct solution. After checking the formula for dimensions, 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 must also indicate the direction of the change (increased, decreased, slowed, etc.).
And finally... I recommend regularly solving physics problems. You will learn to "see" them from the inside, even without drawings. 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 your studies at university. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
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It's dedicated to repairing, understanding the operation and design of household appliance...