Identify in which of the following cases friction plays a helpful role.

Lighting a matchstick

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Writing on a blackboard with a chalk

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Wearing of shoes

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Heating of machinery

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Solution

The correct options are
A
Lighting a matchstick

B
Writing on a blackboard with a chalk

Striking a matchstick causes heat which helps light the match. The friction between the surface irregularities of chalk and the board causes the breaking of bonds and hence leaves behind the remnants of the chalk on the board. Heating of machinery and wearing of shoes are not desirable.

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Similar questions

In which of the following cases, friction plays a useful role?
(1) Lighting a matchbox
(2) Playing snooker
(3) Writing on a black board.

Looking at the picture given below:

Identify the picture(s) in which friction plays a helpful role.

Look at the pictures given below:

(a)

(b)

(c)

Identify the picture in which friction plays a helpful role.

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