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The sign of work done by a force on a bo...

The sign of work done by a force on a body is important to understand . State carefully if the following quantities are positive or negative.
(a) work done by a man in lifting a bucket out of a well by mass of a rope tied to the bucket .

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Work done is positive as both the force and displacement are in same direction.
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The sign of work done by a force on a body is important to understand . State carefully if the following quantities are positive or negative. (b) work done by friction on a body sliding down an inclined plane.

The sign of work done by a force on a body is important to understand . State carefully if the following quantities are positive or negative. (c ) work done by an applied force on a body moving on a rough horizontal plane with uniform velocity.

State the conditions under which the work done by a force is positive or negative.

A boy tried to lift a bucketful of water , but failed. What is the work done by him ?

Statement I: Work done by constant force is equal to magnitude of force multiplied by displacement . Statement II: Work done is scalar quantity. It may be positive, negative or zero.

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