Question

What is kinetic energy? Give two examples.

Answer 1

Hi there !

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Answer :

Kinetic Energy : The energy of an object because of its motion is called its kinetic energy.

Let's see it in details ;

Consider a ball kept in contact with a block on a table [see the first picture]. The ball and the block stay at rest and no work is done by the ball on the block [see the 2nd picture]. Now suppose, the ball is separated from the block and is moved towards it with a speed v.

Also, suppose that The ball sticks to the block as it hits it. The ball pushes the block forward and the block is displaced. So, the moving ball can do work on the block whereas the same ball, when at rest, cannot do any work.

We conclude that a moving ball has more capacity to do work than an otherwise similar ball at rest. In other words, a body has more energy when it is moving than when it is at rest.

Therefore, the energy of an object because of its motion is called its kinetic energy.

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Thanks for the question !

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Answer 2

Dear Student,

Mechanical energy of an object is divided into kinetic energy and potential energy.

◆ Kinetic energy -

• Energy possessed by the body by virtue of its motion is called kinetic energy.

It is given by formula -

• KE = mv²/2

# Examples of kinetic energy -

• Motion of a car running on a straight road.
• Motion of an object rolling down a slope.
• Motion of a bullet shot from a gun.

Thanks dear. Hope this helps you.