Question

For every action, there exists an equal and opposite reaction. State true or false.
A. True
B. False

Answer 1

Hint: When we push down on your desk with the fingers, the desk will be pushed up on your fingers with a similar force. If we hit a wall with your head, the force exerted by our head will be experienced on the wall. At the same time, the wall will be exerting an equal and opposite force on our heads. Because of this reaction, there will be a pain in our head.

Complete step by step solution:
Newton's 3rd Law says that for every action there will be a reaction, which is equal and opposite. This law implies that if body A is acting a force $F$ on body B, then body B will always be exerting a force ${F}'$ on body A. These two forces, $F\text{ and }{F}'$, are equal in magnitude but they are opposite in direction. Here the force will be a vector, therefore we can write that,
$F=-{F}'$.
Here we can say that $F$ is the action force and ${F}'$ is the reaction force. Let us discuss an example. When we push down on your desk with the fingers, the desk will be pushed up on your fingers with a similar force. If we hit a wall with your head, the force exerted by our head will be experienced on the wall. At the same time, the wall will be exerting an equal and opposite force on our heads. Because of this reaction, there will be a pain in our head. Therefore the given statement is true.
The answer is given as option A.

Note: In the above-cited examples, either force will be assumed to be the action, or the other can be taken as the reaction. In the everyday life of Science and Technology, Newton's Third Law can be applicable to the recoil of a gun, the jet and rocket propulsion, and also the humans walking every day and so on.