Задача 1.16. КИНЕМАТИКА | Учимся решать задачи по физике с нуля

If you have decided to learn how to solve physics problems from scratch, then you have come to the right place. On my channel, I will analyze a large number of problems on kinematics, dynamics and other sections of physics with a very simple and accessible explanation of the algorithm for solving the problem. I think that almost anyone will understand. On this channel, I plan to post solutions to problems, tips and recommendations for schoolchildren and students who want to learn how to solve physics problems. Therefore, if you have questions regarding my problems, if you would like to clarify something, ask in the comments. If necessary, I will record video answers to your questions. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ Problem 1.16 The distance between metro stations is l=1.5 km. The train covers the first half of this distance with uniform acceleration, the second half with uniform deceleration with the same acceleration in magnitude. The maximum speed of the train is V=50 km/h. Find the acceleration a and the time t of the train's movement between the stations. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ ▼ MY MAIN CHANNEL (electrical engineering):    / @toeravilov   ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ ▼ Page in VK: https://vk.com/art_rav ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ ► DOWNLOAD A PHOTO OF MY PHYSICS NOTEBOOK: (in the "Physics" section) https://www.toe1.ru ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ ✅ Thank the author channel: 4276510010822044 (Sberbank) ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ 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 you should write the vector equation in projections. In most cases, a drawing greatly simplifies the process of solving any problem, not only in physics. A drawing is also necessary if the body is moving or at an angle. -You need to check whether all the given quantities in the problem are in the same system of units (SI, CGS, and others). If the quantities are given in different systems, they should be expressed in units of the system you have adopted for the solution. Preference is given to the SI system, but not always. So, the problem statement is complete, now we can start solving the problem. -We think over the physical content of the problem, find out which section it belongs to, and which laws should be used in it. Problems can be combined, their solution requires the use of laws from several sections of physics. -Next, you should write down the formulas corresponding to the laws used in the problem, you should not immediately look for the unknown value; you need to see if all the parameters in the formula are known. If the number of unknowns is greater than the number of equations, you need to add the equations that follow from the condition and the figure. General principle: how many unknowns, so many formulas should there be. Then all that remains is to solve the system of equations, that is, reduce the problem from physical to mathematical. -A common mistake: incomplete understanding of the meaning of the parameters in the formula. -The solution to the problem should most often be performed in a general form, that is, in letter notations. -Having received a solution in a general form, you need to check the dimensionality of the resulting value. To do this, substitute not numbers into the formula, but the dimensions of the quantities included in it. After checking the formula for dimensionality, you should substitute the numerical values ​​of the quantities included in it and make a calculation. -Next, you need to analyze and formulate an answer. If the question was "how has it changed...", then you need to indicate the direction of the change (increased, decreased, slowed down, etc.). And finally... I advise you to regularly solve physics problems. Start solving problems every day and after a while you will feel that you can solve each subsequent problem faster and with less effort. You will learn to "see" them from the inside even without a drawing. But this skill is developed only through regular training. The ability to quickly solve problems will be useful not only when passing exam tests, but also when studying at a university. #Kinematics #PhysicsProblems #PhysicsFromScratch #KinematicsProblems #USEinPhysics