Question

The magnitude of friction depends on

• A. Irregularities on the surface
• B. Density of the objects
• C. Normal reaction between surfaces
• D. Weight of an object

Answer 1

Answer: (A), (C)

The correct options are
A

Irregularities on the surface

C

Normal reaction between surfaces

Friction is caused by the irregularities on the two surfaces in contact. Even those surfaces which appear very smooth have a large number of minute irregularities on them. The interlocking of these irregularities gives rise to friction. Normal force is the amount of force acting perpendicular to the surface in contact. The magnitude of friction depends upon the normal force between surfaces not the weight of the objects.