Question

Person X pushes twice as hard against a stationary brick wall as person Y. Which one of the following statements is correct?

Answer 1

Answer:

D) Both do zero work

Explanation:

The work done by a force is given by:

$W=Fd cos \theta$

where

F is the force applied

d is the displacement

$\theta$ is the angle between the direction of the force and the displacement

From the formula, we notice that work is done online when the displacement is non-zero, so when the object is moving.

In this problem, the wall is stationary: this means that the displacement is zero, d = 0, so no work is done.