1. The main disadvantage of friction is that it produces heat in various parts of machines.
2. Due to friction we have to exert more power in machines.
3. Due to friction, noise is also produced in machines.
4. The biggest disadvantage of friction is wear and tear that happens as a result of friction.
5. Friction slows down the motion of moving objects.
6. Friction cause energy loss.
7. Engines of automobiles consume more fuel due to friction.
8. Forest fires are due to friction between the branches of the trees.
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