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Question
Is there any possibility of making a special device to measure the magnitude of friction directly?
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Solution
Yes. Tribometer is a special device to measure the magnitude of friction directly.
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RELATED QUESTIONS
Write true or false.
The sliding friction is more than the rolling 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.
.................... is the SI unit of force.
Fill in the blank.
Rolling friction offers ............. resistance than sliding friction.
Fill in the blank.
Friction depends upon the ............... of an object.
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?
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 |
In the following figure, a boy is shown pushing the box from right to left. The force of friction will act on the box
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.
