Question

Statement I: When a brick is pushed on a soft carpet, there is friction only because of uneven interlocking of surfaces.
Statement II: When a brick is pushed on a soft carpet, there is friction because carpet has a soft surface and can undergo deformations.

• A. Only statement I is correct.
• B. Only statement II is correct.
• C. Both statements I and II are correct.
• D. Neither statement I nor statement II is correct.

Answer 1

The correct option is B Only statement II is correct.

When an object slides on a soft surface, it causes deformation in the surface which opposes relative motion. This is referred to as the plowing effect and results in frictional force. In case of a brick moving on a carpet, the soft surface of the carpet deforms easily and resists motion of the brick.