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

(1) and (2) only

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(2) and (3) only

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(1) and (3) only

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(1), (2) and (3)

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Solution

The correct option is D
(1), (2) and (3)

All these examples show, there are many different situations where friction is absolutely necessary. All the above activities are completely friction dependent.

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

The correct option is D (1), (2) and (3)All these examples show, there are many different situations where friction is absolutely necessary. All the above activities are completely friction dependent.

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

The correct option is D
(1), (2) and (3)

All these examples show, there are many different situations where friction is absolutely necessary. All the above activities are completely friction dependent.