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प्रश्न
Define static friction
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उत्तर
The maximum force exerted by a surface on a body so long as it remains stationary is called the force of static friction.
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संबंधित प्रश्न
Write true or false.
Liquids offer more friction than the gases.
Fill in the blank.
We use ball bearings to .................. the friction.
Name the three kinds of friction.
Answer the following.
What do you understand by a force?
Tick the most appropriate answer
Friction always
Fill in the blank.
Bicycles use ...................... to reduce friction between the pedals and the crank
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.
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 |
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.
