Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 237 · 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 2 N, a glass sheet 3 N, a carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
3. 3.🛞 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, sandpaper 9 N, ice 3 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 9 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
5. 5.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a smooth steel slide (d) a rough doormat
6. 6.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
7. 7.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 2 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
9. 9.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
10. 10.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
11. 11.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
12. 12.True or false: a wet tiled floor gives less friction. (a) True (b) False
13. 13.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
14. 14.True or false: a grippy rubber sole gives less friction. (a) True (b) False
15. 15.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 3 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) chalk on a gym bar (d) a wet tiled floor
18. 18.True or false: sand on a slippery path gives more friction. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) powder on a carrom board (d) a tyre with deep treads
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
21. 21.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 7 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
23. 23.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
24. 24.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, a carpet 9 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
26. 26.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
27. 27.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 7 N, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, ice 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 2 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
32. 32.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
33. 33.🛞 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 most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
34. 34.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
35. 35.True or false: a tyre with deep treads gives less friction. (a) True (b) False
36. 36.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
37. 37.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
38. 38.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, sandpaper 13 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
40. 40.True or false: powder on a carrom board gives less friction. (a) False (b) True

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