Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 103 · 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: ice 4 N, a wooden plank 8 N, a carpet 10 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to go slower (d) to look nice
3. 3.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 12 N, ice 2 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) a tyre with deep treads (d) a rough doormat
6. 6.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
7. 7.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a tyre with deep treads
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
9. 9.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 10 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 9 N, ice 4 N, a glass sheet 5 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
12. 12.True or false: powder on a carrom board gives more friction. (a) False (b) True
13. 13.True or false: a grippy rubber sole gives more friction. (a) True (b) False
14. 14.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
17. 17.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 8 N, sandpaper 9 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) glass (d) polished marble
20. 20.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) sand on a slippery path (d) a wet tiled floor
21. 21.True or false: a tyre with deep treads gives less friction. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) skating on ice (d) a rough doormat
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 9 N, a glass sheet 2 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
24. 24.🛞 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 9 N, sandpaper 13 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
25. 25.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) a box pushed on carpet (d) skating on ice
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 5 N, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 1 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
28. 28.🛞 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 11 N, sandpaper 15 N. How many newtons more were needed on sandpaper than on a glass sheet?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 3 N, a carpet 4 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
30. 30.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
31. 31.True or false: skating on ice gives more friction. (a) False (b) True
32. 32.True or false: sand on a slippery path gives less friction. (a) True (b) False
33. 33.True or false: a wet tiled floor gives less friction. (a) True (b) False
34. 34.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
36. 36.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) cold (d) wet
37. 37.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
38. 38.True or false: a grippy rubber sole gives less friction. (a) True (b) False
39. 39.True or false: a rough doormat gives less friction. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) chalk on a gym bar (c) a box pushed on carpet (d) a rough doormat

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