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Give some examples of smooth and rough surfaces.
Explain increasing and decreasing friction with suitable examples.
What are the various types of friction? Explain.
What do you mean by fluid friction? How can fluid friction be reduced?
Why are the worn-out tyres discarded?
Give some examples to show that friction produces heat.
If we push the book on the table, it stops after sometime. Why?
What are the two factors on which the force of friction depends?
What is a measure of static friction?
When the two surfaces are pressed harder, friction increases. Explain why?
How does the friction depend on the nature of the surface?
What is a spring balance?
Write advantages and disadvantages of friction.