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प्रश्न
Give examples to show that friction is both a friend and a foe.
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उत्तर
Examples to show that friction is a friend:
- Friction enables us to grip and catch various objects.
- It allows us to walk pleasantly on the surface.
- It helps reduce the speed of moving items.
- It will enable us to write on paper or blackboards.
- Friction prevents objects from moving from their original positions.
Examples to show that friction is a foe:
- Friction wears and tears items.
- It damages machine parts.
- Machines and tools require constant maintenance, which wastes a lot of money.
- It slows down moving objects, requiring more significant force.
- It prohibits the free movement of items.
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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.
Select the correct alternative.
Friction is reduced by
Define static friction
Define sliding friction
Arrange the following in descending order:
- static friction
- sliding friction and
- rolling friction?
Answer the following in a word or two or in a sentence.
Which type of force acts on a string pulled from both ends?
Tick the most appropriate answer.
A car skids on a wet or muddy road due to
Tick the most appropriate answer.
Friction for an object can be reduced by
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.
Why is difficult for a pen to leave a mark on a highly smooth plastic sheet?
Answer the following in short.
Define rolling friction and give an example where rolling. friction comes into play.
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?
Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play
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: There is a danger of a vehicle skidding on a wet road.
Reason: The tires of the vehicle lose their grip on the road due to an increase in friction due to the presence of water on the road.
