Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 300 · 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: ice 1 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) a tyre with deep treads (d) a grippy rubber sole
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
4. 4.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
5. 5.🛞 More or less friction: chalk on a gym bar? (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 carpet 9 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
7. 7.True or false: a grippy rubber sole gives more friction. (a) True (b) False
8. 8.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to grip the road (d) to save rubber
9. 9.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) sand on a slippery path (d) powder on a carrom board
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 6 N, a carpet 10 N, sandpaper 13 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
11. 11.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
12. 12.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
13. 13.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
14. 14.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
15. 15.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
16. 16.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
17. 17.True or false: powder on a carrom board gives more friction. (a) False (b) True
18. 18.🛞 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 6 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 9 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 5 N, a carpet 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, ice 4 N, a glass sheet 6 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
22. 22.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
23. 23.True or false: chalk on a gym bar gives less friction. (a) False (b) True
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, sandpaper 10 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
27. 27.🛞 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 wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
28. 28.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
29. 29.🛞 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 9 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
30. 30.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a tyre with deep treads (d) oil on a squeaky hinge
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 6 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
32. 32.True or false: powder on a carrom board 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: a glass sheet 8 N, a carpet 11 N, sandpaper 14 N, ice 4 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
34. 34.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a box pushed on carpet (d) skating on ice
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
36. 36.True or false: a smooth steel slide gives less friction. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) oil on a squeaky hinge (d) powder on a carrom board
38. 38.🔍 Which is the odd one out? (a) a wet tiled floor (b) a grippy rubber sole (c) powder on a carrom board (d) a wheel on ball bearings
39. 39.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
40. 40.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False

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