(b) Write two disadvantages of friction.
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Disadvantages of friction:
It always resists the motion, so extra energy is required to overcome it.
It causes wear and tear of machines.
It decreases the life expectancy of moving parts of vehicles.
Since friction is very useful in some cases while harmful in some cases, friction is called a necessary evil.
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Her sole purpose is to protest against human cruelty towards animals and nature
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