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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
Select the correct alternative.
Friction is reduced by
When you apply brakes, the bicycle stops and the rim of the wheel becomes hot? Explain the reason.
A body needs a force F1 just to start moving on a surface, a force F2 to continue its motion and a force F3 to roll on the surface. What is
- the static friction
- sliding friction and
- rolling friction? State whether F2 is equal, less than or greater than (1) F1 and (2) F3.
Answer the following.
What do you understand by a force?
Fill in the blank.
.................... is the SI unit of force.
Answer the following in a word or two or in a sentence.
Why does a rolling ball stop after moving some distance?
Fill in the blank.
The force of friction acting between two bodies in contact while at rest is known as ................ friction.
Complete the analogy.
Knot in a thread : _____ friction : : Ball bearing : _____ friction
How do you feel when you touch a nail immediately after it is hammered into a wooden plank? Why?
Friction depends on the ______ of two surfaces in contact.
