Question

A swimmer uses her feet to push off the wall and the wall exerts the same force back on her. The force exerted by the wall on the swimmer is called ___________
a. action force
b. friction
c. gravity
d. reaction force

Answer 1

Answer: Option d

Explanation:

According to Newton's third law, for every force "P" that is applied on an object there is a force -P that has the same maginitud that "P" and opposite direction.

In other words "for every action there is an  equal and opposite reaction"

For example, if Object D applies a force "P" on an object B, then object B will make a force -P on object D.

This force is called the reaction force.

Therefore when the swimmer pushes the wall, then the wall pushes the swimmer with a force of the same magnitude that is called the reaction force.