Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 885 · 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) more friction (b) less friction
2. 2.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 14 N, ice 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
5. 5.True or false: a rough doormat 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.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
9. 9.True or false: a box pushed on carpet gives more friction. (a) True (b) False
10. 10.True or false: sand on a slippery path gives less friction. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a wet tiled floor
12. 12.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 10 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
14. 14.True or false: a tyre with deep treads gives less friction. (a) False (b) True
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 11 N, ice 3 N, a glass sheet 7 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
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 9 N, sandpaper 10 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a wheel on ball bearings (d) sand on a slippery path
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
20. 20.True or false: a wheel on ball bearings 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: a glass sheet 4 N, a wooden plank 7 N, sandpaper 9 N, ice 3 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: ice 4 N, a glass sheet 8 N, a carpet 11 N, sandpaper 15 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 8 N, sandpaper 11 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
24. 24.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
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 6 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
26. 26.True or false: a rough doormat gives more friction. (a) False (b) True
27. 27.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
28. 28.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, sandpaper 11 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
30. 30.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
31. 31.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) magnetic (d) wet
32. 32.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) sand on a slippery path (d) a tyre with deep treads
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 8 N, sandpaper 9 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: sandpaper 12 N, ice 2 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
36. 36.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 12 N, ice 3 N, a glass sheet 7 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, sandpaper 9 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
40. 40.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False

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