Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 941 · 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.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) a smooth steel slide (d) a rough doormat
2. 2.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 4 N, sandpaper 6 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 5 N, a carpet 9 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
6. 6.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a grippy rubber sole (d) a wet tiled floor
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 2 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
8. 8.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, sandpaper 13 N, ice 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
10. 10.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
11. 11.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
12. 12.True or false: a rough doormat gives more friction. (a) False (b) True
13. 13.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
14. 14.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
15. 15.True or false: a grippy rubber sole gives less friction. (a) False (b) True
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 7 N, sandpaper 9 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 6 N, sandpaper 9 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
20. 20.🛞 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) a wooden plank (b) a carpet (c) ice (d) sandpaper
21. 21.True or false: skating on ice gives less friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, ice 2 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
25. 25.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
26. 26.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
27. 27.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) skating on ice (d) oil on a squeaky hinge
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 1 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
29. 29.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) skating on ice (d) a grippy rubber sole
30. 30.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
31. 31.True or false: chalk on a gym bar gives less friction. (a) True (b) False
32. 32.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
33. 33.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) sand on a slippery path (d) a wet tiled floor
34. 34.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on a glass sheet?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 1 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
38. 38.🛞 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, sandpaper 7 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
39. 39.🔍 Which is the odd one out? (a) powder on a carrom board (b) a tyre with deep treads (c) a wheel on ball bearings (d) a wet tiled floor
40. 40.🛞 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, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet

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