Friction
Q.1. What is the force of friction?
Q.2. Give examples of the force of friction.
Q.3. Give an example of contact force.
Q.4. What is the cause of the force of friction?
Q.5. Which factors affect the force of friction?
Q.6. Which factors do not affect friction?
Q.7. What is static friction?
Q.8. What is sliding friction?
Q.9. Which is greater, static friction or sliding friction?
Q.10. What is rolling friction?
Q.11. ‘Friction is necessary evil’. Comment on this statement.
Q.12. Give an account of the advantages of friction.
Q.13. Give an account of disadvantages of friction.
Q.14. What are the two methods of increasing friction?
Q.15. Give examples where friction is increased.
Q.16. What are the methods to reduce friction?
Q.17. What are lubricants?
Q.18. What is done to reduce friction where oil can not be used as lubricant?
Q.19. Can we reduce friction to zero?
Q.20. What is drag?
Q.21. On what factors does the frictional force on an object in a fluid depend?
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