Question

W=Fiscos 8) =Fscos
(7) State the condition under which the
done is (i) positive (ii) negative (iii) zero.
Why is the work done on an object move
with uniform circular motion zero?
Ans. The work done is positive when the for
acting on the body and the displacement of the bo
have the same direction
ative when the​

Answer 1

Answer:

Work done is equal to Force (acting in the direction of displacement) times the displacement i.e. W=F.S where (.) is dot product. For the work done we need component of force along the direction of displacement but displacement and force are 90°, at each and every point on the circular track and therefore the component of force along the direction of displacement will always be zero in case of a body moving in a circular track or a body performing circular motion. We know W=F.S or F.Scos(θ), since body is moving in circular track cos(θ)=0 , and hence whole term will be 0 i.e. Work done will be 0.

Explanation:

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