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Question

In which of following, friction is acting as a friend:​
1. Walking on road

2. Writing with chalk

3. Wear and tear of tyres


4.Catching fire in the rocket at a high speed​


A
Both 1 and 2​
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B
2 only​
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C
3 only
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D
Both 3 and 4​
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Solution

The correct option is A Both 1 and 2​
Friction helps in walking on the road and writing with the chalk on the board. Without friction we cannot walk and write with chalk.
Friction causes wear and tear of the tyres and can cause fire in a rocket entering the atmosphere at very high speed. These are the undesirable effects of friction.
Hence, in the case of walking on the road and writing with chalk, friction acts as a friend.

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