Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 676 · 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.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
2. 2.True or false: a smooth steel slide gives more friction. (a) True (b) False
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 8 N, a carpet 11 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
4. 4.True or false: a smooth steel slide gives less friction. (a) False (b) True
5. 5.True or false: a box pushed on carpet gives less friction. (a) False (b) True
6. 6.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
7. 7.True or false: a grippy rubber sole gives more friction. (a) True (b) False
8. 8.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
9. 9.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
10. 10.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 10 N, sandpaper 11 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
13. 13.True or false: chalk on a gym bar gives more friction. (a) False (b) True
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 9 N, sandpaper 12 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
15. 15.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
16. 16.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
17. 17.🛞 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 carpet 4 N, sandpaper 5 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
19. 19.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
20. 20.True or false: a rough doormat gives more friction. (a) False (b) True
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 5 N, a wooden plank 9 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
23. 23.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
24. 24.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
26. 26.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
27. 27.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
28. 28.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a grippy rubber sole
29. 29.True or false: powder on a carrom board gives more friction. (a) True (b) False
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 10 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
32. 32.True or false: a wet tiled floor gives more friction. (a) True (b) False
33. 33.True or false: skating on ice gives less friction. (a) True (b) False
34. 34.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 8 N, sandpaper 12 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 12 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
37. 37.True or false: a wet tiled floor gives less friction. (a) False (b) True
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 9 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 14 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
40. 40.True or false: powder on a carrom board gives less friction. (a) False (b) True

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