Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 637 · 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 wooden plank 6 N, a carpet 10 N, sandpaper 11 N, a glass sheet 3 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
2. 2.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) chalk on a gym bar (d) a wet tiled floor
3. 3.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
4. 4.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
5. 5.True or false: a wet tiled floor gives more friction. (a) False (b) True
6. 6.🛞 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 carpet 5 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
8. 8.True or false: a tyre with deep treads gives less friction. (a) False (b) True
9. 9.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
10. 10.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to go slower (d) to look nice
11. 11.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
12. 12.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) skating on ice (d) a tyre with deep treads
13. 13.True or false: skating on ice gives less friction. (a) True (b) False
14. 14.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
15. 15.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
16. 16.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
17. 17.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 3 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
19. 19.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
20. 20.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 10 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
22. 22.True or false: skating on ice gives more friction. (a) False (b) True
23. 23.🛞 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 4 N, sandpaper 5 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
24. 24.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
25. 25.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
26. 26.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a smooth steel slide (c) a wheel on ball bearings (d) skating on ice
27. 27.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
28. 28.🔍 Which is the odd one out? (a) a smooth steel slide (b) sand on a slippery path (c) a grippy rubber sole (d) a tyre with deep treads
29. 29.True or false: a box pushed on carpet gives less friction. (a) False (b) True
30. 30.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
31. 31.True or false: chalk on a gym bar gives less friction. (a) False (b) True
32. 32.True or false: a rough doormat gives more friction. (a) True (b) False
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 8 N, sandpaper 11 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
34. 34.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) chalk on a gym bar (c) a tyre with deep treads (d) a grippy rubber sole
35. 35.True or false: a rough doormat gives less friction. (a) True (b) False
36. 36.True or false: a box pushed on carpet gives more friction. (a) True (b) False
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 1 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 5 N, sandpaper 7 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 6 N, ice 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank

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