37. Friction is called a necessary evil. This means it has both advantages and
disadvantages. Mention two ways to increase and two ways to decrease friction.
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Use of lubricants: In machines, friction can be reduced by applying lubricants between the contact surfaces to fill the fine pores or depressions in the surfaces and make them smooth thereby reducing friction.
Polishing : unevenness of the surfaces can be reduced by polishing, thereby reducing the friction.
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