Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 64 · 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 glass sheet 4 N, a wooden plank 8 N, a carpet 11 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
2. 2.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a smooth steel slide (d) skating on ice
3. 3.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
4. 4.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
5. 5.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
6. 6.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) glass (d) sandpaper
7. 7.True or false: a rough doormat gives more friction. (a) False (b) True
8. 8.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
9. 9.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a wet tiled floor (d) a rough doormat
10. 10.True or false: a box pushed on carpet gives less friction. (a) True (b) False
11. 11.🛞 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, sandpaper 7 N, ice 2 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
12. 12.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) chalk on a gym bar (d) skating on ice
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 8 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
14. 14.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
15. 15.True or false: a rough doormat gives less friction. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) a box pushed on carpet (d) oil on a squeaky hinge
17. 17.🛞 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 3 N, sandpaper 5 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
18. 18.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) a wheel on ball bearings (d) a smooth steel slide
19. 19.True or false: a tyre with deep treads gives more friction. (a) True (b) False
20. 20.True or false: a grippy rubber sole gives more friction. (a) True (b) False
21. 21.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 8 N, sandpaper 9 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: ice 2 N, a glass sheet 5 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 Friction acts … (a) only on ice (b) against the motion (c) only upwards (d) with the motion
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 1 N, a glass sheet 2 N, a wooden plank 3 N. How many newtons more were needed on a carpet than on ice?
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 6 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
29. 29.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
30. 30.True or false: powder on a carrom board gives more friction. (a) False (b) True
31. 31.True or false: chalk on a gym bar 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: a carpet 8 N, ice 1 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
33. 33.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
34. 34.🛞 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 carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
35. 35.True or false: sand on a slippery path gives less friction. (a) True (b) False
36. 36.True or false: a box pushed on carpet gives more friction. (a) True (b) False
37. 37.True or false: a smooth steel slide gives more friction. (a) False (b) True
38. 38.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
39. 39.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
40. 40.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) a wheel on ball bearings (d) a grippy rubber sole

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