Question

A pencil eraser loses tiny pieces of rubber each time you use it . Why does this happen ?
8. Name the device which is used between the hubs and axles of bicycle wheel to reduce friction .
9. Name two lubricants .
10. What is done to increase friction between tyres and roads ?

Answer 1

A rubber loses tiny pieces because friction makes it break a small piece every time it is used.
8.Ball bearings
9. Oil, Grease
10. Tyres are made rough

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Answer 2

1. because of friction
2.ball bearings
3. grease,lubricating oil
4. grooves are given in the tires or breaks are applied



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