Answers

2015-08-01T02:17:20+08:00
Heat, it can be a cause of power e.g. engines when powers on and used long enough to produce heat. It can be cause of friction e.g. rubbing both the palms of your hands. P.S. It may be much better help if you look from your old books or any reference books that deals with science. That's all.
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2015-08-01T08:30:58+08:00