Newton's Third Law of Motion, also known as the Law of Action and Reaction, states that for every action, there is an equal and opposite reaction. This means that when one object exerts a force on another object, the second object exerts a force of equal magnitude but in the opposite direction on the first object.

Example 1: When you push a book on a table, the book exerts an equal and opposite force on your hand.

Example 2: When a rocket propels itself forward by expelling gases backward, the expelled gases experience an equal and opposite force, propelling the rocket forward.

Example 3: In a game of billiards, when the cue ball collides with the target ball, the target ball exerts an equal and opposite force on the cue ball, causing it to recoil.

This law demonstrates the conservation of momentum, as the total momentum of the system remains constant but is transferred between objects.