which one is the following is useful friction a=wheels and hub friction b=crankshaft friction
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b=crankshaft friction.......
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Friction is the resistive force which prevents the motion of two solid surfaces,liquid layers or any kind of material elements sliding against each other.
According to the question:
The most useful friction is
Option B=Crankshaft friction
Because this kind of friction enhances and balances the working power measurements of any normal Crankshaft.
That's why it is more useful than the wheel and the hub friction.
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