Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 559 · 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: tyres wearing down? (a) a problem (b) helpful
2. 2.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
3. 3.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to go slower (d) to save rubber
4. 4.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
5. 5.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
6. 6.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 4 N, sandpaper 5 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
8. 8.True or false: a tyre with deep treads gives less friction. (a) False (b) True
9. 9.True or false: a rough doormat gives less friction. (a) False (b) True
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
11. 11.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) powder on a carrom board (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 6 N, a carpet 8 N, sandpaper 9 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
15. 15.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
16. 16.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
17. 17.True or false: a smooth steel slide gives more friction. (a) True (b) False
18. 18.True or false: sand on a slippery path 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: sandpaper 13 N, ice 3 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 11 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
21. 21.True or false: chalk on a gym bar gives less friction. (a) False (b) True
22. 22.True or false: a grippy rubber sole gives less friction. (a) False (b) True
23. 23.True or false: skating on ice gives more friction. (a) True (b) False
24. 24.🛞 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 5 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
25. 25.True or false: a rough doormat gives more friction. (a) True (b) False
26. 26.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
27. 27.🛞 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 6 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
28. 28.True or false: powder on a carrom board gives more friction. (a) False (b) True
29. 29.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
30. 30.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
31. 31.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
32. 32.True or false: a tyre with deep treads gives more friction. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) skating on ice (d) a rough doormat
34. 34.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
36. 36.True or false: sand on a slippery path gives less friction. (a) True (b) False
37. 37.🛞 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 9 N, ice 2 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
38. 38.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
39. 39.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 10 N. How many newtons more were needed on sandpaper than on a glass sheet?

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