Prabhash Singh

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University of Calabar, Crossriver State, Nigeria

ROHIT KUMAR

Delhi Technological University, Delhi, India

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F O R -7 t h , 8 t h , 9 t h , 1 0 t h , 1 1 t h & 1 2 t h MEENA STUDY CENTRE

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FRICTION CLASS VIII

MEENA STUDY CENTRE BY-PRABHASH PRATAP SINGH I. Multiple choice questions (MCQ) 05 X 1 = 05 marks.... more MEENA STUDY CENTRE BY-PRABHASH PRATAP SINGH I. Multiple choice questions (MCQ) 05 X 1 = 05 marks. 01.Heat can be produced by: a) Pressure b) Friction c) Force d) None of these. 02. Limiting friction indicates: a) Maximum value of static friction b) Maximum value of rolling friction c) Maximum value of sliding friction d) None of these 03. The frictional force on an object in a fluids depends on: a) Speed of an object b) Shape of an object c) Nature of the fluids d) all of these. 04. A measuring device used to measure the force: 05. The frictional force exerted by fluids is called: a) Rolling force b) Static force c) Drag d) None of these II. Very short answer type questions (20 words) 05 X 2 = 10 marks. 11. What is meant by relative motion? 12. Why do you sleep while stepping on a banana peel? 13. On which things, frictional force depends? 14. What is meant by air resistance? 15. Why is it more difficult to walk on a wet floor? III. Short answer type question (35-40 words) 10 X 3 = 30 marks. 16. What are fluids? 17. Why is it difficult to walk on ice? 18. Define efficiency. 19. Which force helps the brake system to stop the car? 20. What are lubricants? 21. How can fluid friction be minimised? 22. Explain why sportsmen use shoes with spikes. 23. Explain why sliding friction is less than static friction. 24. You spill a bucket of soapy water on a marble floor accidentally. Would it make easier or more difficult for you to walk on the floor? Why? Long answer type question (50-60 words) 5 X 5 = 25 marks. 25. (a) Define streamlining. (b) What is the function of ball-bearing? 26. (a) How do trees help reduce friction? (b) Why do meteors burn on entering the atmosphere? 27. (a) Why do kabaddi players rub their hands with soil? (b) Why do gymnasts apply some coarse substance on their hands? 28. Why does friction increase if the two surfaces are pressed? 29.Write three advantage of friction. or Why it is easier to move a box which is already moving than one which is at rest?

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