Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 819 · 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 6 N, a carpet 9 N, sandpaper 11 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 6 N, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
5. 5.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
7. 7.🛞 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 10 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
8. 8.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a wheel on ball bearings (d) a rough doormat
9. 9.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
10. 10.🔍 Which is the odd one out? (a) a smooth steel slide (b) sand on a slippery path (c) a tyre with deep treads (d) a rough doormat
11. 11.True or false: a tyre with deep treads gives more friction. (a) False (b) True
12. 12.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
14. 14.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
15. 15.True or false: sand on a slippery path gives more friction. (a) True (b) False
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 5 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
18. 18.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 11 N, ice 4 N, a glass sheet 8 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
20. 20.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
21. 21.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
22. 22.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) a rough doormat (d) a wet tiled floor
23. 23.True or false: sand on a slippery path gives less friction. (a) False (b) True
24. 24.True or false: a wet tiled floor gives more friction. (a) False (b) True
25. 25.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
26. 26.True or false: a rough doormat gives less friction. (a) True (b) False
27. 27.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 8 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
29. 29.True or false: powder on a carrom board gives more friction. (a) False (b) True
30. 30.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
31. 31.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
33. 33.🛞 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 11 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
34. 34.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
35. 35.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) a box pushed on carpet (d) a rough doormat
36. 36.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
37. 37.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
38. 38.True or false: chalk on a gym bar gives less friction. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) skating on ice (d) powder on a carrom board
40. 40.True or false: a smooth steel slide gives more friction. (a) True (b) False

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