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प्रश्न
Answer the following in short.
How can sliding friction be changed into rolling friction easily?
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उत्तर
Sliding friction can be changed into rolling friction easily by providing wheels or ball bearings to the objects to reduce friction and facilitate easy movement.
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संबंधित प्रश्न
Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why?
Fill in the blank.
We use ball bearings to .................. the friction.
State two factors which directly affect the force of friction.
When you apply brakes, the bicycle stops and the rim of the wheel becomes hot? Explain the reason.
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Smoother the surface, ................. is the frictional force offered by it.
Fill in the blank.
Friction depends upon the ............... of an object.
Answer the following in short.
Define rolling friction and give an example where rolling. friction comes into play.
In the following figure, a boy is shown pushing the box from right to left. The force of friction will act on the box
Analogy
Objects placed at rest on earth: ______:: Bodies slide over the surface on other body: ______.
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.
