Question

give five situations where we can say that work is done on the object and another five situations where no work is done on the object?
Work is done: No work is done:

Answer 1

Answer:

holaate

lotate

hope this will hej

Answer 2

Answer:

$\huge\fcolorbox{black}{lime}{❥ᴀ᭄ɴsᴡᴇʀ}$

Explanation:

We know work done by a force is given by ,

W=Fdcosθ ,

(A) The angle between force exerted by elevator on man's shoes and displacement of shoes is 0 , therefore W=Fd=0 .

(B) The angle between force exerted by man on box and displacement of box is 0 , therefore W=Fd=0 , (though net work done is zero) constant velocity means force exerted by man equals the frictional force .

(C) The angle between force exerted by man and displacement of ball is 90 degree, therefore W=Fd=0 .

(D) The angle between force exerted by person on brick and displacement of brick is 180 , therefore W=−Fd =0