Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 916 · 40 questions

Engineer's tip (Rough grips, smooth slides): More friction: rough, dry, grippy. Less friction: smooth, oiled, wet, icy, rolling, powdered. Helpful for grip and braking; a problem when it wears or heats parts. Friction test: bigger force needed → more friction.

1. 1.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
2. 2.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a carpet 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 8 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a smooth steel slide (d) a grippy rubber sole
6. 6.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
7. 7.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) ice (d) polished marble
8. 8.True or false: a smooth steel slide gives less friction. (a) False (b) True
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 10 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, sandpaper 5 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
11. 11.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
14. 14.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
15. 15.True or false: a smooth steel slide gives more friction. (a) True (b) False
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, a glass sheet 3 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
18. 18.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
19. 19.True or false: skating on ice gives less friction. (a) False (b) True
20. 20.True or false: chalk on a gym bar gives less friction. (a) False (b) True
21. 21.True or false: powder on a carrom board gives less friction. (a) False (b) True
22. 22.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
23. 23.True or false: a wet tiled floor gives more friction. (a) False (b) True
24. 24.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
25. 25.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
26. 26.True or false: sand on a slippery path gives less friction. (a) False (b) True
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
28. 28.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
29. 29.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
31. 31.True or false: a grippy rubber sole gives less friction. (a) True (b) False
32. 32.True or false: a tyre with deep treads gives less friction. (a) False (b) True
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 10 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
36. 36.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 5 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
38. 38.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
39. 39.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 15 N, ice 3 N, a glass sheet 7 N, a wooden plank 11 N. How many newtons more were needed on a carpet than on ice?

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