Friction is a force which opposes relative motion.It is measured basing on the roughness of the surface and it is measured with coefficient of friction. We do know that there is lot of disadvantages because of friction like wear and tear of mechanical parts of machines but without friction we cannot survive.That is why, friction is called necessary is evil. Friction does not opposes motion but it opposes relative motion.
Here in this series of small video lessons, all basic aspects of friction were explained. Each video lesson is short and explains only a specific topic with all the basics required. In general nothing is taken, some thing like basics of the subject is known to some one who is learning from this resource.
Here are the list of topics from the chapter friction.
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