From the following activities find out whether work is positive, negat

1.	From the following activities find out whether work is positive, negative or zero. Give reasons for your(a) A boy is swimming in a pond. (b) A coolie is standing with a load on his head. (c) Stopping a moving car by applying brakes. (d) Catching the ball which you friend has thrown towards you.
Answer» (a) A boy is swimming in a pond: The work done is positive because the direction of applied force and displacement are the same. (b) A coolie is standing with a load on his head: The work done is zero because the applied force does not cause any displacement. (c) Stopping a moving car by applying brakes: The work done is negative because the fore applied by the brakes acts in a direction opposite to the direction of motion of car. (d) Catching the ball which you friend has thrown towards you : Negative work because the force required to stop the ball, acts opposite to the displacement of the ball.

From the following activities find out whether work is positive, negative or zero. Give reasons for your(a) A boy is swimming in a pond. (b) A coolie is standing with a load on his head. (c) Stopping a moving car by applying brakes. (d) Catching the ball which you friend has thrown towards you.

Answer»

(a) A boy is swimming in a pond: The work done is positive because the direction of applied force and displacement are the same.

(b) A coolie is standing with a load on his head: The work done is zero because the applied force does not cause any displacement.

(c) Stopping a moving car by applying brakes: The work done is negative because the fore applied by the brakes acts in a direction opposite to the direction of motion of car.

(d) Catching the ball which you friend has thrown towards you : Negative work because the force required to stop the ball, acts opposite to the displacement of the ball.

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