Answers

2015-09-22T20:17:58+05:30
Friction can be both friend and foe.
FRIEND:
1 It helps in construction of buildings.
2 It helps in walking on the ground.
FOE:
1 soles of shoe and tyres of vehicles wear out due to friction.
2 friction can also produce heat. so it can damage the machines.
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2015-09-23T15:54:00+05:30
Friction is our friend as well as our enemy.this is because we are able to walk on ground due to friction only and it is our enemy because the heat produced by friction an damage our machines
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