Question

Q 1Which will travel faster hovercraft or a streamer? Why?
Q2 What are the three factors affecting fluid friction?
Q3 Give three examples to justify friction is a necessary evil.
. Q4 Explain :
(a) Why Kabaddi players rub their hands with dry soil?
(b) Why Ball bearings are used in moving parts of machines?
(c) Why steps of foot-over bridges at railway stations wear out slowly? (d) Why spikes are provided in Sports shoes?
(e) Why powder is sprinkled on the carom board?

Answer 1

Answer:

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Answer 2

Explanation:

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