There isn't really any, in fact without friction life wouldn't be possible. Friction is not a force/mass/energy. It is a reaction caused to bodies of mass sliding by each other so friction does not have any harmful effects.
There isn't really any, in fact without friction life wouldn't be possible. Friction is not a force/mass/energy. It is a reaction caused to bodies of mass sliding by each other so friction does not have any harmful effects.
Friction sometimes is really harmful as it causes tsunamis and earthquakes.
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