Friction

Friction Worksheet-4

11. Does friction depend on smoothness of the surface?

12. Which surface produces more friction?

13. Which type of surface produces less friction?

14. What is the direction of frictional force?

15. What is the cause of friction between two surfaces?

16. Which surface has more irregularities smooth or rough surface?

17. How many types of friction?

Friction Worksheet-5

31. Give two examples where friction is undesirable.

32. What do you mean by lubricants?

33. Why are oil, creams and grease called lubricants?

34. How are the shoes made to counter the friction and make better grip?

35. What is used in cycle brakes to increase friction?

36. Name the substance which is used in carrom board to reduce friction.

Friction Worksheet-6

51. What is spring balance?

52. How does the friction affected by the nature of surface?

53. Take two bricks; one is wrapped in jute while other is wrapped in polythene. Which one will be easy to drag and why?

54. Why is it easy to drag a mat from the floor, but it is difficult to drag the mat when some body is sitting on it?

55. What is static and sliding friction?

56. Which is smaller static friction or the sliding friction and why?