Q4 of 55 Page 361

What is kinetic energy?

Energy of a body due to its motion is called kinetic energy. For example: a running motorcycle has kinetic energy, a falling stone also possesses kinetic energy, but when the motion stops, kinetic energy is lost.

Kinetic energy (KE) of a body of mass m moving with velocity or speed v is given by the formula:


KE = m v2


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2

Define energy.

 3

Define power.

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What is potential energy?

 6

Give reason for the following :

The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy ? Why?