Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 174 · 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: a wooden plank 6 N, a carpet 10 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
2. 2.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) oil on a squeaky hinge (d) chalk on a gym bar
3. 3.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 12 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
5. 5.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
6. 6.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
7. 7.True or false: sand on a slippery path gives more friction. (a) True (b) False
8. 8.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
9. 9.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) a wheel on ball bearings (d) sand on a slippery path
10. 10.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
11. 11.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
12. 12.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 9 N, sandpaper 12 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
14. 14.True or false: a rough doormat gives more friction. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) a box pushed on carpet (d) oil on a squeaky hinge
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, sandpaper 11 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🛞 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 5 N, sandpaper 9 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
18. 18.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) powder on a carrom board (d) a wet tiled floor
19. 19.🛞 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, a carpet 9 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 14 N, ice 4 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
21. 21.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) a tyre with deep treads (d) skating on ice
22. 22.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 8 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
25. 25.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a smooth steel slide (d) a grippy rubber sole
26. 26.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
27. 27.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
28. 28.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
29. 29.True or false: a smooth steel slide gives less friction. (a) False (b) True
30. 30.True or false: a tyre with deep treads gives less friction. (a) True (b) False
31. 31.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
32. 32.🛞 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 carpet 3 N, sandpaper 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
33. 33.True or false: a grippy rubber sole gives less friction. (a) False (b) True
34. 34.True or false: a grippy rubber sole gives more friction. (a) True (b) False
35. 35.True or false: chalk on a gym bar gives less friction. (a) False (b) True
36. 36.🛞 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) a wooden plank (c) sandpaper (d) a glass sheet
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 2 N, a glass sheet 6 N, a wooden plank 10 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
38. 38.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
39. 39.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
40. 40.🛞 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, sandpaper 14 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper

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