Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 735 · 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 7 N, ice 3 N, a glass sheet 5 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
3. 3.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
4. 4.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) chalk on a gym bar (d) a box pushed on carpet
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
6. 6.🛞 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 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, sandpaper 16 N, ice 4 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
8. 8.True or false: a tyre with deep treads gives more friction. (a) True (b) False
9. 9.True or false: a rough doormat gives more friction. (a) True (b) False
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
11. 11.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
12. 12.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
13. 13.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) chalk on a gym bar (d) a wet tiled floor
14. 14.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 6 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 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
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 1 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
18. 18.True or false: a box pushed on carpet gives more friction. (a) True (b) False
19. 19.True or false: a smooth steel slide gives more friction. (a) False (b) True
20. 20.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
21. 21.True or false: a grippy rubber sole gives more friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
23. 23.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
24. 24.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 4 N, sandpaper 5 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
26. 26.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) press parts harder (d) add sand
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 3 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
28. 28.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
29. 29.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) skating on ice (d) a tyre with deep treads
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
31. 31.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
32. 32.🛞 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 15 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 4 N, sandpaper 6 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
34. 34.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 9 N, sandpaper 10 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
36. 36.True or false: a rough doormat gives less friction. (a) False (b) True
37. 37.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
38. 38.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, sandpaper 8 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 4 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank

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