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Nature of surface in contact

Applying lubr...

Question

Applying lubricants to machines increases their efficiency.

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Solution

The correct option is A
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Applying lubricants to moving parts of machines reduces friction between them. This means that energy that is lost as heat due to friction is reduced. Hence, efficiency of the machine is increased.

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Q. The two ends of a spring are displaced along the length of the spring. All displacement have equal magnitudes. In which case or cases the tension or compression in the spring will have a maximum magnitude?
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(b) both ends are displaced towards right
(c) both ends are displaced towards left
(d) the right end is displaced towards left and the left end towards right.

Q. Applying lubricants to machines increases their efficiency.

Q. Applying oil to machines increases their efficiency.

Applying oil to machines increases the efficiency of the machine.

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