Engineering Worksheet: Friction

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

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