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प्रश्न
Fill in the blank.
Weight remaining the same, friction is independent of ............. of surface in contact.
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उत्तर
Weight remaining the same, friction is independent of area of surface in contact.
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संबंधित प्रश्न
Sometimes, a crackling sound is heard while taking off a sweater during winters. Explain.
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.
The force of friction acting between two bodies in contact while at rest is known as ................ friction.
Fill in the blank.
Smoother the surface, ................. is the frictional force offered by it.
Answer the following in a word or two or in a sentence.
Name a method used to reduce friction.
Answer the following in detail.
Write the characteristics of the force of friction?
Answer the following in detail.
Describe three different ways by which friction can be increased to help us in various situations?
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.
