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प्रश्न
Friction opposes the ______ between the surfaces in contact with each other.
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उत्तर
Friction opposes the motion between the surfaces in contact with each other.
Explanation:
This means that when two objects move or try to move past each other, friction resists their movement, acting in the opposite direction to slow them down or prevent motion altogether.
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संबंधित प्रश्न
Friction depends on the ______ of surfaces.
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.
Explain why sportsmen use shoes with spikes.
Give examples to show that friction is both a friend and a foe.
State two factors which directly affect the force of 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.
Sliding friction and rolling friction are types of .................. friction.
Tick the most appropriate answer.
Friction is offered by
Tick the most appropriate answer.
A car skids on a wet or muddy road due to
Tick the most appropriate answer.
If you pour some oil onto a floor, the friction would
Fill in the blank.
Smoother the surface, ................. is the frictional force offered by it.
Fill in the blank.
Friction is a type of .................
State if the following statement is true or false. Correct the statement if it is false.
Friction is offered by all the three states of matter.
Answer the following in short.
Define rolling friction and give an example where rolling. friction comes into play.
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 |
Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play
Analogy
Objects placed at rest on earth: ______:: Bodies slide over the surface on other body: ______.
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.
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.
