Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 358 · 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.True or false: a rough doormat gives more friction. (a) False (b) True
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
3. 3.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
4. 4.🛞 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 7 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
5. 5.True or false: a tyre with deep treads gives more friction. (a) False (b) True
6. 6.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) oil on a squeaky hinge (d) a smooth steel slide
7. 7.🛞 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, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
8. 8.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
9. 9.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
10. 10.True or false: a grippy rubber sole gives more friction. (a) True (b) False
11. 11.True or false: powder on a carrom board gives less friction. (a) True (b) False
12. 12.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
13. 13.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
14. 14.True or false: powder on a carrom board gives more friction. (a) True (b) False
15. 15.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, a carpet 9 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
17. 17.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
19. 19.🛞 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 10 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 5 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.True or false: a wet tiled floor gives less friction. (a) True (b) False
22. 22.True or false: chalk on a gym bar gives more friction. (a) True (b) False
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 4 N, a glass sheet 7 N, a wooden plank 10 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
24. 24.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a glass sheet 3 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🔍 Which is the odd one out? (a) a smooth steel slide (b) a box pushed on carpet (c) chalk on a gym bar (d) a rough doormat
27. 27.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
28. 28.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) a rough doormat (d) a grippy rubber sole
29. 29.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) chalk on a gym bar (d) skating on ice
30. 30.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
31. 31.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
32. 32.True or false: a wet tiled floor gives more friction. (a) False (b) True
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 2 N, a wooden plank 3 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
34. 34.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more 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 10 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
36. 36.True or false: a rough doormat gives less friction. (a) True (b) False
37. 37.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 8 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
39. 39.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?

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