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प्रश्न
Fill in the blank.
Sliding friction and rolling friction are types of .................. friction.
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उत्तर
Sliding friction and rolling friction are types of kinetic friction.
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संबंधित प्रश्न
Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why?
Write true or false.
Liquids offer more friction than the gases.
Fill in the blank.
We use ball bearings to .................. the friction.
Give an example to illustrate the existence of the force of friction.
Fill in the blank.
.................... is the SI unit of force.
Tick the most appropriate answer.
Friction for an object can be reduced by
Answer the following in short.
How can sliding friction be changed into rolling friction easily?
A moving body comes to rest due to friction alone.
Match the following.
| Column I | Column II | |
| a) | Static friction | viscosity |
| b) | Kinetic friction | least friction |
| c) | Rolling friction | objects are in motion |
| d) | Friction between the liquid layers | objects are sliding |
| e) | Sliding friction | objects are at rest |
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.
