what do you mean by friction ?? what are the disadvantages of it? what it is also called as..
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Friction is the resistance to motion of one object moving relative to another.
The main disadvantage of friction is that it produces heat in various parts of machines. In this way some useful energy is wasted as heat energy. Due to friction, engines of automobiles consume more fuel which is a money loss.
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This phenomenon, which is responsible for stopping objects in motion, is known as friction. It generally acts in the opposite direction with respect to the direction of motion. Friction – Friction is the force, which resists the relative motion of surfaces or bodies sliding against each other.
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