explain newtons third law

Asked by paddipawar | 11th Nov, 2014, 06:24: PM

Expert Answer:

According to Newton's third law of motion: Whenever one body exerts a force on another body, the second body exerts an equal and opposite force on the first body. 
Example: When you pull a spring with both hands, you feel an equal force trying to pull the spring back.
The force exerted by the first body on the second is known as "action" and the force exerted by the second body on the first body is known as "reaction".  We can also say that, To every action there is an equal and opposite reaction.
Action and reaction act on two different bodies but they act simultaneously.
Suppose a box resting on the ground.
The box is exerting downward force of its weight on the ground. The downward weight of the box is balanced by an equal, upward force supplied by the ground. Now, the force exerted by the weight of the box is "action" and its acts on the ground whereas the force exerted by the ground on the box is "reaction" and it acts on the box. Since the box is in equilibrium under the action of two forces it neither goes up not goes down, i.e. the "action" of the box must be equal and opposite to the "reaction" of the ground. Thus, action and reaction act on two different bodies.

Answered by Faiza Lambe | 12th Nov, 2014, 09:33: AM