Question

1.2

A brick slides on a rough horizontal surface. Which ONE of the following
actions will increase the frictional force acting on the brick?
A. Decreasing the surface area of contact
B. Increasing the surface area of contact
C. Putting a second brick on it
D. Decreasing the mass of the brick
10-H
IS

Answer 1

C. Putting a second brick on it

force of friction = mu (coefficient of friction) * normal force

normal force = mass * force of gravity

In order to increase the frictional force, mass must be added to increase the normal force and thus the amount of applied friction.

Answer 2

B

Step-by-step explanation:

Because it has to increase