Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 280 · 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: a wooden plank 3 N, a carpet 6 N, sandpaper 8 N, a glass sheet 1 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
2. 2.🔍 Which is the odd one out? (a) a smooth steel slide (b) sand on a slippery path (c) powder on a carrom board (d) a wheel on ball bearings
3. 3.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
5. 5.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a smooth steel slide (d) a box pushed on carpet
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
7. 7.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
8. 8.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
9. 9.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 10 N, sandpaper 14 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.True or false: a grippy rubber sole gives more friction. (a) True (b) False
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, sandpaper 9 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
13. 13.True or false: chalk on a gym bar gives more friction. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) a rough doormat (d) a tyre with deep treads
15. 15.🛞 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 5 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 7 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 4 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
18. 18.🛞 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, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
19. 19.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
20. 20.🛞 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. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
21. 21.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
22. 22.🛞 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 7 N, sandpaper 11 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 11 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, sandpaper 10 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 6 N, a carpet 10 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
27. 27.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) skating on ice (d) a wet tiled floor
28. 28.True or false: a rough doormat gives more friction. (a) False (b) True
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 8 N, a wooden plank 11 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
30. 30.🛞 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. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
32. 32.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
34. 34.🛞 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, a carpet 10 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
35. 35.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) powder on a carrom board (d) a box pushed on carpet
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
38. 38.🔍 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
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 11 N, a carpet 15 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
40. 40.True or false: powder on a carrom board gives more friction. (a) True (b) False

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