Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 232 · 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.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
2. 2.True or false: a grippy rubber sole gives less friction. (a) True (b) False
3. 3.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to grip the road (d) to save rubber
4. 4.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
5. 5.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 8 N, sandpaper 10 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
7. 7.True or false: a rough doormat gives less friction. (a) False (b) True
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 5 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
9. 9.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
10. 10.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) a grippy rubber sole (d) chalk on a gym bar
11. 11.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
12. 12.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
13. 13.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
14. 14.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) 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 10 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
18. 18.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
19. 19.🛞 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 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
22. 22.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
23. 23.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
24. 24.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
25. 25.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) a smooth steel slide (d) chalk on a gym bar
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
27. 27.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 10 N, sandpaper 14 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: sandpaper 5 N, ice 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 1 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
32. 32.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a wheel on ball bearings (d) a box pushed on carpet
33. 33.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) a smooth steel slide (d) a tyre with deep treads
34. 34.🛞 More or less friction: a tyre with deep treads? (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 carpet 9 N, ice 2 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
36. 36.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
37. 37.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) a wheel on ball bearings (d) a grippy rubber sole
38. 38.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
39. 39.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) powder on a carrom board (d) a rough doormat
40. 40.True or false: chalk on a gym bar gives less friction. (a) True (b) False

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