Give reason-
a. Ball bearings are used in many machine parts.
b.
Sand is strewn on roads in mountains after heavy snow fall.
C.
Grease is applied in bicycle parts from time to time.
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A.. As ball bearings reduces friction. They are used to reduce the friction of certain moving parts of the machine. This is done by replacing sliding friction with rolling friction.
B.. This must be a local phenomenon. some form of soil can be present due to erosion when it rains and it eventually settles in the plain areas.
C.. Grease is applied in bicycle parts to prevent ingress of water and incompressable material. As grease-lubricated parts has greater frictional characteristics due to their high viscosity.
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