Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 332 · 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 carpet 4 N, sandpaper 8 N, ice 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
2. 2.True or false: a box pushed on carpet gives more friction. (a) False (b) True
3. 3.🛞 Friction acts … (a) with the motion (b) against the motion (c) only upwards (d) only on ice
4. 4.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 9 N, a glass sheet 2 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
6. 6.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
7. 7.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) a wheel on ball bearings (d) a rough doormat
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) oil on a squeaky hinge (b) a tyre with deep treads (c) a grippy rubber sole (d) a box pushed on carpet
10. 10.True or false: skating on ice gives more friction. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) a smooth steel slide (d) a grippy rubber sole
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 7 N, a glass sheet 1 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
13. 13.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
14. 14.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) skating on ice (d) a box pushed on carpet
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, sandpaper 12 N, a glass sheet 4 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
16. 16.True or false: chalk on a gym bar gives less friction. (a) False (b) True
17. 17.🛞 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 wooden plank 6 N, a carpet 9 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
18. 18.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a smooth steel slide (c) sand on a slippery path (d) a rough doormat
19. 19.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) chalk on a gym bar (d) a box pushed on carpet
20. 20.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) magnetic (d) warm
21. 21.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
22. 22.🛞 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 11 N, sandpaper 14 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
23. 23.True or false: powder on a carrom board gives more friction. (a) False (b) True
24. 24.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
25. 25.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a carpet 12 N, sandpaper 13 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) a box pushed on carpet (d) a rough doormat
28. 28.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
30. 30.🛞 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 9 N, sandpaper 11 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
31. 31.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
32. 32.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
33. 33.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 9 N, a glass sheet 3 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
35. 35.True or false: a smooth steel slide 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 8 N, a carpet 10 N, sandpaper 13 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 1 N, a wooden plank 5 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
38. 38.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
39. 39.🛞 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 most friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
40. 40.True or false: a grippy rubber sole gives less friction. (a) False (b) True

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