6. (a) What is a lubricant?
(b) How does a lubricant reduce friction ?
(c) What kind of lubricant is used in (i) a sewing machine, (ii) the axle of a tractor?
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(a) A lubricant is a substance, usually organic, introduced to reduce friction between surfaces in mutual contact, which ultimately reduces the heat generated when the surfaces move.
(b) A lubricant is a substance, usually organic, introduced to reduce friction between surfaces in mutual contact, which ultimately reduces the heat generated when the surfaces move. ... It may also have the function of transmitting forces, transporting foreign particles, or heating or cooling the surfaces.
(C) I) light machine oil is used in sewing machines. ii)heavy grease is used in the axle of a tractor.
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