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Q.

The disadvantages of friction are


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a

Friction causes a waste of energy

b

Friction wears out the rubbing surfaces

c

Friction generates heat.

d

All of these 

answer is D.

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Detailed Solution

The disadvantages of friction are that it causes a waste of energy, wears out the rubbing surfaces and generates heat.
This is because the moving object should overcome friction in order to be in motion. The rubbing surfaces are worn out due to friction. The soles of our shoes are worn out due to friction. Heat is generated by the huge machinery parts. Thus, these are the disadvantages of friction. Also, lubricants applied to reduce friction can also produce unnecessary friction in some cases.
 
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