Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 618 · 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) sand on a slippery path (b) a wheel on ball bearings (c) a grippy rubber sole (d) a rough doormat
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 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 11 N, sandpaper 15 N. How many newtons more were needed on sandpaper than on a glass sheet?
4. 4.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 1 N, a wooden plank 2 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) powder on a carrom board (d) a wheel on ball bearings
7. 7.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
8. 8.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 8 N, ice 3 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, sandpaper 14 N, ice 4 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
12. 12.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
13. 13.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
14. 14.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) a tyre with deep treads (d) powder on a carrom board
15. 15.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
16. 16.True or false: a tyre with deep treads gives less 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 glass sheet 3 N, a carpet 5 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
19. 19.True or false: a rough doormat gives less friction. (a) True (b) False
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, sandpaper 9 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
22. 22.True or false: powder on a carrom board gives more friction. (a) False (b) True
23. 23.True or false: a grippy rubber sole gives more friction. (a) False (b) True
24. 24.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
25. 25.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
26. 26.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
27. 27.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
28. 28.True or false: chalk on a gym bar gives more friction. (a) True (b) False
29. 29.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) wet (d) magnetic
30. 30.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
32. 32.True or false: sand on a slippery path gives more friction. (a) True (b) False
33. 33.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
34. 34.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a carpet 9 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
36. 36.True or false: powder on a carrom board gives less friction. (a) True (b) False
37. 37.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 8 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
39. 39.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
40. 40.True or false: a rough doormat gives more friction. (a) True (b) False

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