Question

Polly is pushing a box across the floor with a force of 30 N. The force of gravity is –8 N, and the normal force is 8 N. Which value could describe the force of friction if Polly could not move the box?

Answer 1

-30 N

Step-by-step explanation:

If she couldn't move the box, then there would have to be a force of equal magnitude but in the opposite direction of the force that's used to push the box.