Give two examples from your daily life where friction is harmful.
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1.Opposes motion of a body hence more energy is needed to overcome the friction.
2.Producing the heart in moving parts of machines leads to wastage of energy.
3.Forest fires are caused due to friction between branches.
4.Noise production leads to energy loss.
5.A lot of money goes in using techniques like greasing and oiling for preventing usual wear and tear caused due to friction.
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