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Answer 1

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19) Rolling friction, Starting friction and Sliding friction...

20) a:- friction produces a lot of heat in various parts of the machinery and this leads to wastage of energy as heat.

b:- opposes motion, hence more energy is needed to overcome fiction

c:- notice production in machines is irritating as well as leads to energy loss.

23) a:- Lubrication is another way tomake a surface smoother.

b:- Reduce the forces acting on the surfaces.

c:- reduce the contact between the surfaces

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Answer 2

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