Question

6. A boy pushes his little brother in a box with a force of 500 N for 324 m How much work is this if the force of

friction acting on the sliding box is (a) 100 N (6) 250. N?

Answer 1

(a) 129600 J

(b) 81000 J

Explanation:

The work done is given by the product of force and the displacement in the direction of force.

Force, F = 500 N

distance, d = 324 m

(a) friction force, f = 100 N

The work done is

W = (F - f) x d

W = (500 - 100) x 324

W = 129600 J

(b) Friction, f = 250 N

The work done is

W = (F - f) d

W = (500 - 250) x 324

W = 81000 J