Question

why does a swimmer push water backward with his hands in order to swim forward

Answer 1

A swimmer push the water backwards to move forward because according to newton's 3rd law of motion in each and every action there is an equal and opposite force so if he push water backwards then acc. to newton's 3rd law he will move forward. 

Answer 2

Answer:

A swimmer push water backward with his hands in order to swim forward by applying Newton's 3rd law of motion.

Explanation:

Newton has given 3 laws of motion regarding the motion of an object. These laws are known as - (i) Newton's 1st law of motion

                                            (ii) Newton's 2nd law of motion

                                            (iii) Newton's 3rd law of motion

The question is related to the 'Newton's 3rd law of motion'. So we will discuss this.

• Newton's 3rd law of motion states that "every action has an equal and opposite reaction."

                             That means if a force is applied to an object then the equal amount of force will be applied by the object in opposite direction.

• When a swimmer swims, he applies force(action) on the water with his hand in backward direction. As a reaction the water also applies equal amount of force to the swimmer in forward direction. This reaction helps the swimmer to move forward.