Question

Find the incorrect statement about friction from the following ones.
(a) Friction is caused by the interlocking of irregularities in the two surfaces in contact.
(b) Using a good quality lubricant, the frictional force between two surfaces can be eliminated.
(c) Frictional force causes wear and tear.
(d) Frictional force is independent of surface area in contact.

• A. (a) and (b) only
• B. (d) only
• C. (b) only
• D. (a) and (c) only

Answer 1

The correct option is C (b) only

• Friction is caused by the irregularities of the surfaces in contact and the bond that may get formed between the two surfaces in contact.
• Using a lubricant can decrease friction but not eliminate it completely.
• Due to the presence of friction, there could be a loss of energy in form of heat, sound, etc. Also, friction leads to the wear and tear of the object.
• Friction force doesn’t depend on the surface area of the objects in contact.