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प्रश्न
Explain how friction can be minimized.
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उत्तर
- Using lubricants:
- A substance, which reduces the frictional force, is called a lubricant. Example: Grease, coconut oil, graphite, castor oil, etc.
- The lubricants fill up the gaps in the irregular surfaces between the bodies in contact. This provides a smooth layer thus preventing direct contact between their rough surfaces.
- Using ball bearing:
Since the rolling friction is smaller than sliding friction, sliding is replaced by rolling with the usage of ball bearings. We can see lead shots in the bearing of a cycle hub.
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संबंधित प्रश्न
Answer the following in a word or two or in a sentence.
Which type of force acts on a string pulled from both ends?
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Force of friction comes into play when a/an
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A car skids on a wet or muddy road due to
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Smoother the surface, ................. is the frictional force offered by it.
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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?
Answer the following in detail.
Define friction and explain how it is useful to us.
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
Complete the analogy.
Knot in a thread : ______ friction :: Ball bearing : ______ friction.
