Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 683 · 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.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 5 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
3. 3.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
4. 4.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
5. 5.🛞 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 6 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 10 N, sandpaper 14 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
7. 7.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) a wet tiled floor (d) oil on a squeaky hinge
8. 8.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
9. 9.🛞 Friction acts … (a) only upwards (b) only on ice (c) against the motion (d) with the motion
10. 10.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
11. 11.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
12. 12.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 6 N, sandpaper 10 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 4 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🔍 Which is the odd one out? (a) powder on a carrom board (b) sand on a slippery path (c) a smooth steel slide (d) a wheel on ball bearings
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 10 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) a glass sheet (b) ice (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 wooden plank 7 N, a carpet 10 N, sandpaper 13 N, a glass sheet 4 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
18. 18.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) a grippy rubber sole (d) a rough doormat
19. 19.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
20. 20.True or false: sand on a slippery path gives less friction. (a) True (b) False
21. 21.True or false: a box pushed on carpet gives less friction. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) skating on ice (d) a box pushed on carpet
23. 23.True or false: a grippy rubber sole gives more friction. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) oil on a squeaky hinge (d) sand on a slippery path
25. 25.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 6 N, sandpaper 7 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
27. 27.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a smooth steel slide (c) powder on a carrom board (d) oil on a squeaky hinge
28. 28.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 6 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 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 3 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
31. 31.True or false: a rough doormat gives more friction. (a) True (b) False
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 12 N, a carpet 13 N. How many newtons more were needed on a carpet than on ice?
33. 33.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) a grippy rubber sole (d) chalk on a gym bar
34. 34.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, a carpet 15 N, ice 3 N, a glass sheet 7 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
36. 36.🛞 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 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
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, ice 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
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 8 N, sandpaper 9 N, a glass sheet 3 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
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 11 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice

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