Question

In the picture shown below, the man is applying force on a stool:

A) True
B) False

Answer 1

Hint: To keep the body in state of rest the net force acting on the body must be zero. When an action force is applied by the body on another body, then using Newton’s first law of motion the body also exert the same magnitude of force on the first object but in the opposite direction.

Complete step by step solution:
Force is defined as the push or pull on a body which changes or tends to change the state, shape and size of the body on which push or pull is applied.
The S.I. unit of force is Newton, which is represented as $N$.
Using Newton’s 2nd law of motion, the amount of force is equal to the product of the mass of the body and the acceleration produced in the body.
Mathematically, the force can be represented as,
$F=ma$
Where,
$F=$ Amount of force applied on the body,
$m=$Mass of the body and
$a=$Acceleration of the body.
The direction of acceleration is in the direction of net force applied on the body.
If net force acting on the body is zero, then acceleration produced in the body will be zero. It means that the body is either in state of uniform motion or in state of rest. This is called Newton’s 1st law of motion, which is also known as the law of inertia.
The earths apply a gravitational force of attraction on the man’s body. To make the body at rest, the stool applies normal force on the body of man and hence, the man sitting on the stool is also applying force on the stool.

Hence, the statement is true.

Note: Action and reaction force acts on two different bodies.
The magnitude of the action and reaction force is equal and in the opposite direction.