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प्रश्न
Tick the most appropriate answer.
Friction for an object can be reduced by
पर्याय
providing wheels
lubricating
streamlining
all of these
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उत्तर
all of these
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संबंधित प्रश्न
Write true or false.
Liquids offer more friction than the gases.
When you apply brakes, the bicycle stops and the rim of the wheel becomes hot? Explain the reason.
Answer the following.
What do you understand by a force?
State if the following statement is true or false. Correct the statement if it is false.
If two forces acting in opposite directions on a body arc of equal magnitude, then the body will not move.
Answer the following in short.
What do you understand by normal force?
Fill in the blank.
Friction depends upon the ............... of an object.
Fill in the blank.
Friction is a type of .................
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 |
Friction depends on the ______ of two surfaces in contact.
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.
