Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 914 · 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.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
2. 2.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
3. 3.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 7 N, sandpaper 10 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
5. 5.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) a rough doormat (d) oil on a squeaky hinge
6. 6.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
7. 7.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 6 N, a carpet 10 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
9. 9.True or false: a wet tiled floor gives more friction. (a) False (b) True
10. 10.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
12. 12.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
13. 13.🛞 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 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) a smooth steel slide (d) oil on a squeaky hinge
15. 15.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
16. 16.True or false: sand on a slippery path gives less friction. (a) False (b) True
17. 17.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to grip the road (d) to save rubber
18. 18.True or false: a tyre with deep treads gives more friction. (a) False (b) True
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 7 N, a wooden plank 8 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 8 N, a glass sheet 1 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
22. 22.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) a wheel on ball bearings (d) oil on a squeaky hinge
23. 23.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 4 N, a glass sheet 5 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
25. 25.True or false: a wet tiled floor gives less friction. (a) False (b) True
26. 26.True or false: chalk on a gym bar gives less friction. (a) False (b) True
27. 27.True or false: a box pushed on carpet gives more friction. (a) True (b) False
28. 28.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
29. 29.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
30. 30.True or false: a grippy rubber sole gives more friction. (a) False (b) True
31. 31.🛞 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, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
32. 32.🛞 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 wooden plank 8 N, sandpaper 12 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
33. 33.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
34. 34.True or false: skating on ice gives more friction. (a) False (b) True
35. 35.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 2 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
37. 37.🛞 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 10 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
38. 38.True or false: a rough doormat gives less friction. (a) True (b) False
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 3 N, a glass sheet 6 N, a carpet 10 N. How many newtons more were needed on sandpaper than on ice?

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