Question

Adjacent diagram shows a body of mass 5kg pulled up an inclined plane by a force of 30N. 

(a) Calculate forced by gravity acting on body. (Take g = 10ms^-2)

(b) Work done by the force in pulling body along the inclined plane

(c) Work done against the force of gravity.

Answer 1

Mass of body = 5kg 

(a) Force of gravity acting on the body 

F = mg 

F = 5 x 10 = 50N 

(b) Work done by force in pulling the body along the inclined plane = F x displacement 

W = 30N x 5m = 150J 

(c) Work done against force of gravity

= (mg) x BC