Question

define kinetic energy and give an example of a body possessing kinetic energy

Answer 1

ENERGY : Energy is the capacity of a body to do work


◆ KINETIC ENERGY : The energy possessed by a body by virtue of its motion is called kinetic energy.

FORMULA :
Let kinetic energy of the body be K.E. and mass be m and velocity be v.
Hence, K.E. = 1/2 × mv²

EXAMPLE:
● A bullet firing from a rocket.
● A running person
● A moving bicycle.

Answer 2

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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