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प्रश्न
What is the cause of friction?
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उत्तर
The cause of friction is the interlocking of the irregular projections on the two surfaces in contact.
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संबंधित प्रश्न
Give three examples to illustrate that friction is a necessary evil.
Define static friction
Define rolling friction
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.
More the roughness of a surface, greater is the ........................
Fill in the blank.
Weight remaining the same, friction is independent of ............. of surface in contact.
Fill in the blank.
Rolling friction is ........... than sliding friction.
Answer the following in short.
When you push something heavy, the resistance you feel decreases as soon as the object starts moving. Explain the reason.
Assertion: Friction always opposes the motion.
Reason: Whenever one surface moves or tries to move over another surface, the force of friction starts acting on the surfaces.
