Question

give 2 examples of negative work?

Answer 1

(i)            When a body is made to slide over a rough surface, the work done by frictional force is negative.

 

(ii)          When brakes are applied on a moving vehicle, the work done by the breaking force is negative.

 

(iii)         When a positive charge is moved towards another positive charge, work done by electrostatic force of repulsion between the charges is negative.

 

(iv)         When a body is lifted, the work done by gravitational force is negative.

Answer 2

The work done by the frictional force, when we bush the book to a distance
The work done by the buoyant force, when a coin is sinking

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