Engineering Worksheet: Friction

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

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