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प्रश्न
Answer the following in short.
Define rolling friction and give an example where rolling. friction comes into play.
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उत्तर
When we roll an object on a surface, the friction produced between the object and the surface is called rolling friction. Example: when we pull our large suitcases on wheels, rolling friction comes into play. The wheels reduce friction and cut down a lot of effort required to move the suitcase (Rolling friction is less than sliding friction).
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संबंधित प्रश्न
Explain why sportsmen use shoes with spikes.
When a glass rod is rubbed with a piece of silk cloth the rod ______.
State two factors which directly affect the force of friction.
Define rolling friction
Answer the following in short.
What do you understand by normal force?
Fill in the blank.
Weight remaining the same, friction is independent of ............. of surface in contact.
Answer the following in detail.
Describe three different ways by which friction can be increased to help us in various situations?
Is there any possibility of making a special device to measure the magnitude of friction directly?
Analogy
Objects placed at rest on earth: ______:: Bodies slide over the surface on other body: ______.
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.
