Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 626 · 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: shoe soles wearing out? (a) a problem (b) helpful
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) a wet tiled floor (d) a smooth steel slide
4. 4.🔍 Which is the odd one out? (a) a smooth steel slide (b) a box pushed on carpet (c) oil on a squeaky hinge (d) skating on ice
5. 5.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
6. 6.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
7. 7.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) skating on ice (d) a smooth steel slide
8. 8.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) a box pushed on carpet (d) sand on a slippery path
9. 9.True or false: a rough doormat gives more friction. (a) True (b) False
10. 10.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 4 N, a glass sheet 6 N, a wooden plank 10 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
12. 12.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 8 N, ice 2 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
14. 14.True or false: powder on a carrom board gives less friction. (a) False (b) True
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 8 N, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, sandpaper 9 N, ice 1 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) helpful (b) a problem
18. 18.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a wet tiled floor (d) a rough doormat
19. 19.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
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 10 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
22. 22.True or false: a grippy rubber sole gives less friction. (a) False (b) True
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 4 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, sandpaper 8 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
25. 25.🛞 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 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
26. 26.True or false: a box pushed on carpet gives less friction. (a) True (b) False
27. 27.🛞 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 14 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.True or false: sand on a slippery path gives more friction. (a) False (b) True
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 7 N, sandpaper 11 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
30. 30.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) a box pushed on carpet (d) oil on a squeaky hinge
31. 31.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
32. 32.True or false: a tyre with deep treads gives more friction. (a) True (b) False
33. 33.True or false: a grippy rubber sole gives more friction. (a) True (b) False
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, ice 4 N, a glass sheet 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
35. 35.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
36. 36.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) sand on a slippery path (d) skating on ice
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 6 N, sandpaper 7 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
38. 38.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
39. 39.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) a rough doormat (d) chalk on a gym bar
40. 40.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction

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