Question

Define newtons third law of motion for

Answer 1

Newton’s Third Law of Motion states: ‘To every action there is an equal and opposite reaction’.  

It must be remembered that action and reaction always act on different objects. The Third Law of Motion indicates that when one object exerts a force on another object, the second object instantaneously exerts a force back on the first object. These two forces are always equal in magnitude, but opposite in direction.  

These forces act on different objects and so they do not cancel each other. Thus, Newton’s Third Law of Motion describes the relationship between the forces of interaction between two objects.  

Whenever two bodies interact with each other, the force exerted by the first body on the second is called action. The force exerted by the second body on the first body is called reaction. The action and reaction are equal and opposite.  

For example, when we placed a wooden block on the ground, this block exerts a force equal to its weight, W = mg acting downwards to the ground. This is the action force. The ground exerts an equal and opposite force W’ = mg on the block in the upward direction. This is the reaction force.

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Answer 2

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✨Third law of motion -

Every action have equal and opposite reaction. Action and reaction act on different bodies.

${\underline{\tt{\orange{Example-}}}}$

• Swimming of a man - Man pushes water in the backward direction (action) and water pushes man in the forward direction (reaction) . In this way man swims.
• Walking of a man - Man pushes the earth backward from right foot (action) . Earth pushes the man forward (reaction) . In this way man walks.