Automobile Engineering in ME
The rolling resistance is because of the friction between the

Wheel rim and road surface
Tyre and the road surface
Wheel rim and tyre
None of the listed here

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Automobile Engineering in ME
The function of a second ring is that it is a

Back up compression ring which will work in place of the top ring when it is broken
Compression ring and aids the top ring in sealing and cooling
Back up oil control ring which will work in place of the bottom ring when it is broken
Cushion ring which prevents piston slap and knock

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