Answers

2015-08-04T20:58:39+05:30
Friction can be considered as a foe because  it wastes large amount of energy when to objects is rubbed together, a large amount of heat energy is released
and also due to friction we have to excert more power in machines
it also opposes the motion
more noise is produced

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2015-08-04T20:58:57+05:30
Friction is a bad thing though it is necessary without friction we can't walk 
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