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प्रश्न
Friction depends on the ______ of surfaces.
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उत्तर
Friction depends on the nature of surfaces.
Explanation:
Friction depends on the nature of surfaces in contact. For a given pair of surfaces, friction depends upon the state of smoothness of those surfaces. Friction depends on how hard the two surfaces press together.
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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.
Give an example to illustrate the existence of the force of friction.
The eraser gets smaller and smaller as you use it more and more. Explain the reason.
Define sliding friction
Arrange the following in descending order:
- static friction
- sliding friction and
- rolling 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.
Fill in the blank.
.................... is the SI unit of force.
Fill in the blank.
Weight remaining the same, friction is independent of ............. of surface in contact.
Tick the most appropriate answer.
Force of friction comes into play when a/an
Tick the most appropriate answer.
Friction is offered by
Tick the most appropriate answer.
Friction produces
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 a word or two or in a sentence.
Name the force responsible for opposing the motion between two bodies in contact.
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 short.
List the various states of matter that offer frictional force?
Answer the following in detail.
Write the characteristics of the force of friction?
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.
