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प्रश्न
Arrange the following in descending order:
- static friction
- sliding friction and
- rolling friction?
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उत्तर
Static friction > Sliding friction > Rolling friction.
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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.
A charged glass rod attracts a charged plastic straw.
List three ways of reducing friction.
Fill in the blank.
.................... is the SI unit of force.
Tick the most appropriate answer.
A car skids on a wet or muddy road due to
Fill in the blank.
Friction depends upon the ............... of an object.
Fill in the blank.
Bicycles use ...................... to reduce friction between the pedals and the crank
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.
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 |
Complete the analogy.
Knot in a thread : _____ friction : : Ball bearing : _____ friction
