In which of the following situation friction is necessary?

Heating of a working mixer

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Running of a water motor

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Striking a matchstick

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None of these

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Solution

The correct option is C
Striking a matchstick

Striking a matchstick produces heat which makes it burn in flames. In the other options, friction gives rise to heat energy and causes wear and tear of machines.

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In which of the following situation friction is necessary?

The correct option is C Striking a matchstick Striking a matchstick produces heat which makes it burn in flames. In the other options, friction gives rise to heat energy and causes wear and tear of machines.

The correct option is C
Striking a matchstick

Striking a matchstick produces heat which makes it burn in flames. In the other options, friction gives rise to heat energy and causes wear and tear of machines.