Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 291 · 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.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
2. 2.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
3. 3.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
4. 4.🔍 Which is the odd one out? (a) skating on ice (b) a smooth steel slide (c) a tyre with deep treads (d) powder on a carrom board
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 glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 10 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, ice 3 N, a glass sheet 7 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
9. 9.True or false: a rough doormat gives more friction. (a) False (b) True
10. 10.True or false: a grippy rubber sole gives more friction. (a) True (b) False
11. 11.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
12. 12.🛞 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 8 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 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 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
14. 14.True or false: powder on a carrom board gives less friction. (a) False (b) True
15. 15.🛞 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 9 N, a carpet 11 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
16. 16.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 3 N, sandpaper 6 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 11 N, sandpaper 12 N, ice 4 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
20. 20.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
21. 21.True or false: a box pushed on carpet gives more friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 2 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
23. 23.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
25. 25.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
26. 26.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a wooden plank 6 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
29. 29.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a box pushed on carpet
30. 30.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, sandpaper 10 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
32. 32.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) sand on a slippery path (d) powder on a carrom board
33. 33.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
34. 34.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
35. 35.True or false: a tyre with deep treads gives less friction. (a) True (b) False
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 12 N, ice 4 N, a glass sheet 8 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
37. 37.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) chalk on a gym bar (d) a wet tiled floor
38. 38.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
39. 39.True or false: powder on a carrom board gives more friction. (a) True (b) False
40. 40.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction

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