User talk:Deveshish

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Comment at Talk:Newton's laws of motion
You posted the following comment:
 * maybe i am wrong but i dont get the third law (to every action there is an opposite and equal reaction )....so according to this if we throw a ball on the wall why does it not comes back at the same velocity??

First, note that talk pages are to discuss improvements to the article, not general discussion about the topic.

To answer your question, the forces at impact are equal. When the ball strikes the wall, the kinetic energy of the ball results in a force on the wall, the deformation of the ball, and a resultant spring back of the ball. The first two result in a a loss of energy, and hence a reduced speed of the ball. Moreover, forces resulting from air pressure, wind, gravity, etc. also affect the speed of the ball bouncing back to you. (You can create a free body diagram of all the forces to determine this.) There are many videos and other sources on the internet that answer this question, such as this example on YouTube. Mind matrix  21:35, 12 October 2020 (UTC)


 * I agree with Mindmatrix. Where they write “The first two result in a loss of energy, ...” this must be interpreted as a loss of kinetic energy, not a loss of total energy because the Law of Conservation of Energy tells us that the total energy remains constant and cannot be created or destroyed. Where kinetic energy is reduced in this way, friction generates heat and that heat causes a matching increase in the thermal energy of the ball and the wall and the surrounding air.


 * I find it unhelpful when Newton’s third law is written in terms of action and reaction. I prefer it to be stated in the following way: If any object A exerts a force of magnitude F on another object B then object B simultaneously exerts a force of the same magnitude F on object A but the two forces act in opposite directions.


 * Examining Newton’s Third Law in this way and trying to account for the transfer of kinetic energy and momentum, it is easiest if we choose an example of two objects that are both free to accelerate perceptibly in response to the collision. When a small object collides with the Earth’s surface or some large object firmly attached to the Earth’s surface such as a building or a wall, some of the kinetic energy and momentum is transferred to the Earth. The mass of the Earth is so large that the small transfer of kinetic energy and momentum resulting from the collision with the small object cannot be measured and can barely be comprehended. This makes it extra difficult to comprehend that Newton’s Third Law is, in fact, describing the event perfectly. Dolphin ( t ) 23:08, 12 October 2020 (UTC)