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Question
State whether friction acts as a friend or a foe in the following situations. Give reasons for your answer.
A) Rubbing of hands during cold weather.
B) Wear and tear of tyres after a long use.
A) Rubbing of hands during cold weather.
B) Wear and tear of tyres after a long use.
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Solution
A) Rubbing of hands during cold weather - Friend
Reason: Due to friction, rubbing of hands produces heat and keeps us warm.
B) Wear and tear of tyres after long use - Foe
Reason: Even new tyres eventually become flat due to the friction between the tyres and the road. It is due to this friction, that the treads present on the surface of a tyre wear out after a long use.
Such tyres have to be replaced with new ones, otherwise vehicle may skid while driving.
Reason: Due to friction, rubbing of hands produces heat and keeps us warm.
B) Wear and tear of tyres after long use - Foe
Reason: Even new tyres eventually become flat due to the friction between the tyres and the road. It is due to this friction, that the treads present on the surface of a tyre wear out after a long use.
Such tyres have to be replaced with new ones, otherwise vehicle may skid while driving.
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