The work done by gravity when a coolie carries a luggage on a horizontal road is zero. How?

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Solution

The gravitational force acts in the vertically downward direction, while the displacement is horizontal. Since the angle between force and displacement is 90 degrees, work done by gravity is zero.

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10 k g

1.7 m

= 10 m s^{- 2}

A coolie is moving on a road with a luggage on his head. Does he perform work against the force of gravity? give reasons for your answer.

Write true or false for each statement:

(a) A coolie does not work against the force of gravity while carrying a luggage on a plane road.

(b) The energy stored in water of a dam is kinetic energy.

(d) Work done by a boy depends on the time in which he does work.

(e) Power spent by a bosy depends on the time for which it does work.

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