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प्रश्न
Fill in the blank.
Bicycles use ...................... to reduce friction between the pedals and the crank
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उत्तर
Bicycles use ball bearings to reduce friction between the pedals and the crank.
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संबंधित प्रश्न
A charged glass rod attracts a charged plastic straw.
Select the correct alternative.
Friction is reduced by
Define rolling friction
Fill in the blank.
Weight remaining the same, friction is independent of ............. of surface in contact.
Tick the most appropriate answer
Friction always
Fill in the blank
Rolling friction is ............. than sliding friction.
Fill in the blank.
Rolling friction is ........... than sliding friction.
Fill in the blank.
Smoother the surface, ................. is the frictional force offered by it.
Answer the following in short.
List the various states of matter that offer frictional force?
Complete the analogy.
Knot in a thread : _____ friction : : Ball bearing : _____ friction
