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