(a) Give one example to show that the sum of potential energy and kinetic energy remains constant if friction is ignored.

(b) State two factors on which the kinetic energy of a moving body depends.

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Solution

(a) During the vertical fall of ball, if friction due to air is neglected, the total sum of p energy and kinetic energy at each point of its path remains same.

(b) The kinetic energy of a moving body depends on the following two factors :
(i) The mass of the body
(ii) The speed of the body.
Greater the mass of the body, higher is its kinetic energy. More the speed of the body, higher is its kinetic energy.

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