Suppose you exert a 400-N force on a wall but the wall does not move. The work you are doing on the wall is : unknown, because the mass of the wall is not given

zero, because the wall is not moving

3920 J

400 J

W = 0 : The work done on the wall is zero, because the wall is not moving

Explanation:

Work theory

Work is the product of a force applied to a body and the displacement of the body in the direction of this force.

W = F*d Formula (1)

W: Work (Joules) (J)

F: force applied (N)

d=displacement of the body (m)

The work is positive (W+) if the force goes in the same direction of movement.

The work is negative (W-) if the force goes in the opposite direction to the movement

Data

F = 400-N

d = 0

Problem development

We apply formula (1) to calculate the work done on the wall:

W = 400*0

W=0