VI. Answer the following questions in brief:
1. What are the main factors on which friction depends?
2. How are ball bearings useful?
3. What are lubricants? What do they have to do with
friction?
4. List two situations where it is desirable to increase
friction.
5. Why are wider tyres more efficient than narrower
tyres at normal speed?
3.
detail.
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Answered by
1
Answer:
Friction depends partly on the smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if they are smooth.
Answered by
0
Answer:
a concave mirror. Drawing
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