Question

State Newton’s third law of motion and give two examples.

Answer 1

Newton’s third law of motion states “to every action there is an equal and opposite reaction.” It is useful for rocket propulsion.
Examples:
(1) Consider a book lying on the table. Its weight (w) acts vertically downward (Action on the table) and the book does not fall. That means the table is exerting equal force on the book, but in the opposite direction [normal reaction R] called reaction. Thus, action and reaction are equal and opposite.

(2) When we swim in the water, we push the water backward [Action], and water, in turn, exerts an equal force on us but in opposite direction (Reaction) i.e. there are two different objects man and water and two forces equal in magnitude and opposite in direction.