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Q.

Is it true that friction is both a friend and foe?


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a

True

b

False 

answer is A.

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Detailed Solution

 The above statement is True.
Friction force is the force acting on an object in the opposite direction of its motion. Walking would not be possible without friction. Friction is, therefore, good. Our feet will only slip if we press them into the earth, if friction will not be there. No two bodies would adhere to one another if there was no friction.
On the other hand, the enemy of machinery is friction because it wears down the parts that come into contact with one another. Thus, they have a shorter life. In addition, frictional forces cause heat to be produced, which harms the machinery.
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