Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 148 · 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.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
2. 2.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
3. 3.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a smooth steel slide
4. 4.True or false: a smooth steel slide gives less friction. (a) True (b) False
5. 5.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, sandpaper 10 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
7. 7.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to look nice (d) to grip the road
8. 8.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
9. 9.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 13 N, ice 4 N, a glass sheet 8 N, a wooden plank 9 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
11. 11.🛞 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 11 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
12. 12.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) skating on ice (d) a wheel on ball bearings
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 14 N, ice 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
14. 14.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
16. 16.True or false: sand on a slippery path gives less friction. (a) False (b) True
17. 17.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a glass sheet 4 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
20. 20.True or false: a rough doormat gives less friction. (a) True (b) False
21. 21.True or false: a wet tiled floor gives less friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
24. 24.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
26. 26.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
27. 27.True or false: powder on a carrom board gives more friction. (a) False (b) True
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 8 N, sandpaper 10 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, ice 2 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
31. 31.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
32. 32.True or false: a grippy rubber sole gives less friction. (a) False (b) True
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 10 N, a carpet 13 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 6 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, sandpaper 11 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
36. 36.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
37. 37.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
38. 38.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) warm (d) wet
39. 39.🛞 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 9 N, sandpaper 11 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
40. 40.True or false: a tyre with deep treads gives less friction. (a) False (b) True

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