Question

Some examples for Newton's third law of motion

Answer 1

★ Newton’s III law :

For every action there exists equal opposite reaction . With this law it is clear that forces always exists in action reaction pair . Single force can never exist

Example 1 :

Let us consider a block suspended by the tring . Earth exerts force on the block ( action ) , the equal amount of force is exerted by the block on the earth ( reaction ) . Similarly block does action on the support through string , the equal amount of reaction is exerted by support on the block ( reaction ) .

Note points for example 1 :

• In this case action and reaction are equal to mg.
• Refer the attachment no. 1 for diagram.

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Example 2 :

While walking , we press the ground (action) with our feet slanted in the backward direction . The ground exerts an equal and opposite force balances our weight and the horizontal component provides us forward motion.

Note for example 2 :

• Refer the attachment no. 2 for diagram.

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Example 3 :

The horse and the cart : Let us consider horse starts pulling the cart from rest and gaining speed with time . Ground exerts force on the horse , whose horizontal component Fₕ . The force exerted by the horse on the cart in forward direction is T . Cart exerts a force T on the horse in the backward direction . In addition to this frictional force on the wheels of the cart in backward direction.

Note for example 3 :

• Refer attachment no. 3 for diagram

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