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प्रश्न
Give an example to illustrate the existence of the force of friction.
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उत्तर
If we stop paddling our bicycle, it gradually slows down and ultimately it stops after traveling a certain distance. This is due to the frictional force between bicycle and ground.
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संबंधित प्रश्न
Suppose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it.
State two factors which directly affect the force of friction.
Define rolling friction
Arrange the following in descending order:
- static friction
- sliding friction and
- rolling friction?
Answer the following.
What do you understand by a force?
Fill in the blank
Rolling friction is ............. than sliding friction.
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?
Complete the analogy.
Knot in a thread : _____ friction : : Ball bearing : _____ friction
In the following figure, a boy is shown pushing the box from right to left. The force of friction will act on the box
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.
