Q. 24

A body is being raised to a height h from the surface of earth. What is the sign of work done by

(a) applied force

(b) gravitational force?

Answer :

(a) When force is applied to raise the body then the angle

between force and displacement is 0°.


Work done =Fscosθ =Fscos0=Fs


sign of work done is positive.


(b)As gravitational force acts in downward direction then the


angle between force and displacement is 180°.


work done =Fscosθ =Fscos180°=-Fs.


sign of work done is negative.


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