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Q.

In which case is friction a disadvantage?


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a

Running a machine

b

Walking

c

Applying brakes

d

Writing 

answer is A.

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Detailed Solution

Friction will be a disadvantage in the case of a machine.
A machine consists of many parts which are in motion simultaneously. During the motion, these parts can rub each other which leads to friction between these parts. It leads to loss of energy in the form of heat energy which further reduces the efficiency of the machine. Also, friction can cause the wear and tear of parts of the machine.
 
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