Engineering Worksheet: Friction

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

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