(a) What is the difference between static and sliding friction? For a given pair of objects, which of the two is greater?
(b) How can a very heavy machine be moved conveniently from one place to another in a factory? (No crane is available for this purpose).

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Solution

(a) The friction between the two surfaces of the bodies which are in contact with each other and also at rest relatively is called static friction.
The friction between the two surfaces of the bodies which are in contact with each other and also sliding relatively is called sliding friction.
For a given pair of objects, static friction is most of the time greater than sliding or kinetic friction due to the amount of the force used to overcome it.

(b) The machine should be placed with small wheels so they can be moved easily in the factory.

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