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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
Fill in the blank.
We use ball bearings to .................. the friction.
Give an example to illustrate the existence of the force of friction.
The eraser gets smaller and smaller as you use it more and more. Explain the reason.
Define rolling friction
Fill in the blank.
Weight remaining the same, friction is independent of ............. of surface in contact.
Fill in the blank.
The force of friction acting between two bodies in contact while at rest is known as ................ friction.
Fill in the blank.
Sliding friction and rolling friction are types of .................. friction.
Fill in the blank
Rolling friction is ............. than sliding friction.
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 |
Analogy
Objects placed at rest on earth: ______:: Bodies slide over the surface on other body: ______.
