Answers

2015-09-19T12:27:07+05:30
FRICTION LEADS TO REAR AND TEAR, IT ALSO CAUSES DAMAGE TO MACHINES. BUT FRICTION HAS MANY ADVANTAGES ALSO. IT HELPS IN WALKING, WRITING WITH A PEN , ETC.
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2015-09-19T12:34:30+05:30
Friction is called a nesscary evil because there is no friction between the two surfaces in contact,then the present day  civilization will be no more-and the
wew were are not able to walk or do anything.

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