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Friction Produces Heat

In which of t...

Question

In which of the following situations is the heat produced due to friction desirable?

A

Operating a mixer grinder

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B

Running a water pump

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C

Lighting a matchstick

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D

Operating an electric fan

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Solution

The correct option is C
Lighting a matchstick

While lighting a matchstick, when the match head is dragged along the striking surface, heat is generated because of friction. This helps in igniting it. However, heating of equipments like mixer grinder, water pump, electric fan etc. is a drawback of friction as it leads to a reduced efficiency.

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