Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 600 · 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.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
2. 2.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
3. 3.True or false: a tyre with deep treads gives more friction. (a) True (b) False
4. 4.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 7 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
6. 6.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
7. 7.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
8. 8.🛞 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 9 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🛞 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 9 N, ice 3 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
11. 11.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
12. 12.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 1 N, a glass sheet 2 N, a carpet 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
14. 14.🛞 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 12 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
15. 15.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to look nice (d) to grip the road
16. 16.True or false: a smooth steel slide gives more friction. (a) True (b) False
17. 17.🛞 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 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
19. 19.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 12 N, ice 3 N, a glass sheet 5 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
21. 21.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
22. 22.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) press parts harder (d) make parts rough
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 10 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
24. 24.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
25. 25.True or false: chalk on a gym bar gives less friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 11 N, a glass sheet 2 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
27. 27.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 5 N, sandpaper 8 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 8 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
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, a glass sheet 1 N, a wooden plank 4 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
31. 31.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, ice 4 N, a glass sheet 7 N. How many newtons more were needed on sandpaper than on ice?
33. 33.True or false: a tyre with deep treads gives less friction. (a) True (b) False
34. 34.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
36. 36.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
37. 37.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
38. 38.True or false: a rough doormat gives more friction. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 3 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
40. 40.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction

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