Question

The frictional force is directly proportional to____ (area/weight)​

Answer 1

Answer:

                weight

Explanation:

First, the volume of friction is nearly independent of the area of contact. If a brick is pulled along a table, the frictional force is similar whether the brick is lying flat or standing on end. Second, friction is directly proportional to the weight that presses the surfaces together.

Answer 2

Explanation: Kinetic friction magnitude is directly proportional to the normal force magnitude and the roughness between the sliding surfaces. Static friction magnitude is directly proportional to the normal force magnitude and the roughness between the sliding surfaces.

I think now you got your answer...