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प्रश्न
Fill in the blank.
Rolling friction offers ............. resistance than sliding friction.
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उत्तर
Rolling friction offers less resistance than sliding friction.
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संबंधित प्रश्न
Give examples to show that friction is both a friend and a foe.
Define sliding 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.
Tick the most appropriate answer
Friction always
Tick the most appropriate answer.
Friction is offered by
Fill in the blank.
Friction depends upon the ............... of an object.
Answer the following in a word or two or in a sentence.
Why is difficult for a pen to leave a mark on a highly smooth plastic sheet?
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.
Answer the following in detail.
Describe three different ways by which friction can be increased to help us in various situations?
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.
