Question

Which sentence states Newton’s third law?



If two objects collide, each object exerts a force in the same direction as the other.
If two objects collide, each object exerts a force equal to and in the opposite direction of the other.
A collision between a moving object and a stationary object is elastic.
A collision between a moving object and a stationary object is inelastic.
If two objects collide, the moving object exerts a greater force than the stationary object.

Answer 1

If two objects collide, each object exerts a force equal to and in the opposite direction of the other.

Answer 2

Explanation:

Sir Issac newton has given three laws of motion i.e.

1. First law of motion

2. Second law of motion

3. Third law of motion

The third law of motion states that, "If two objects collide, each object exerts a force equal to and in the opposite direction of the other". The applied force is called action force and its effect on another object is called reaction force. These two forces are applied on different objects. Mathematically, it is equal to :

$F_{1,2}=-F_{2,1}$

$F_{1,2}$ is the force on object 1 due to object 2

$F_{2,1}$ is the force on object 2 due to object 1

So, the correct option is (b) "If two objects collide, each object exerts a force equal to and in the opposite direction of the other".