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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
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B
(d) only
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C
(b) only
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D
(a) and (c) only
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Solution

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.

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