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प्रश्न
Answer the following in short.
List the various states of matter that offer frictional force?
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उत्तर
The force of friction is offered by all the three states of matter – solids, liquids, and gases.
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संबंधित प्रश्न
Friction opposes the ______ between the surfaces in contact with each other.
Give examples to show that friction is both a friend and a foe.
Define rolling friction
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.
Fill in the blank.
.................... is the SI unit of force.
Fill in the blank.
Weight remaining the same, friction is independent of ............. of surface in contact.
Fill in the blank.
The force of friction acting between two bodies in contact while at rest is known as ................ friction.
Fill in the blank.
Bicycles use ...................... to reduce friction between the pedals and the crank
Answer the following in detail.
Define friction and explain how it is useful to us.
Complete the analogy.
Knot in a thread : ______ friction :: Ball bearing : ______ friction.
