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प्रश्न
State if the following statement is true or false. Correct the statement if it is false.
Friction helps us to grip the objects in our hand.
विकल्प
True
False
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उत्तर
True
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संबंधित प्रश्न
When a glass rod is rubbed with a piece of silk cloth the rod ______.
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.
Answer the following in short.
Define force. Write its SI unit.
Fill in the blank.
More the roughness of a surface, greater is the ........................
Fill in the blank.
Smoother the surface, ................. is the frictional force offered by it.
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Friction is a type of .................
Answer the following in a word or two or in a sentence.
Name a method used to reduce friction.
Is there any possibility of making a special device to measure the magnitude of friction directly?
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.
