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प्रश्न
Fill in the blank.
Friction is a type of .................
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उत्तर
Friction is a type of contact force.
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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?
Sometimes, a crackling sound is heard while taking off a sweater during winters. Explain.
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.
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
How do you feel when you touch a nail immediately after it is hammered into a wooden plank? Why?
Why is a ball bearing used in a cycle hub?
Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play
Assertion: We can live very happily if friction is not present in nature.
Reason: The airplane shape is streamlined to reduce the effort of frictional force.
