Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 69 · 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.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a grippy rubber sole
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, sandpaper 5 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
3. 3.🛞 Friction acts … (a) only upwards (b) only on ice (c) against the motion (d) with the motion
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, ice 1 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
5. 5.True or false: a rough doormat gives less friction. (a) True (b) False
6. 6.True or false: skating on ice gives more friction. (a) False (b) True
7. 7.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 13 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
9. 9.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
10. 10.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
12. 12.True or false: a tyre with deep treads 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: sandpaper 9 N, ice 1 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
14. 14.🛞 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, sandpaper 5 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 5 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
16. 16.🛞 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 11 N, a glass sheet 3 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
17. 17.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
18. 18.🛞 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 10 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) skating on ice (d) powder on a carrom board
20. 20.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
21. 21.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
22. 22.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
23. 23.🛞 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 wooden plank 8 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
24. 24.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
26. 26.True or false: a wet tiled floor gives more friction. (a) False (b) True
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 13 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 10 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 10 N, a glass sheet 1 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
30. 30.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
31. 31.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
32. 32.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
33. 33.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
34. 34.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
35. 35.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
36. 36.🛞 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 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
37. 37.True or false: a wet tiled floor gives less friction. (a) False (b) True
38. 38.🛞 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 9 N, a glass sheet 4 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 11 N, ice 4 N, a glass sheet 8 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
40. 40.True or false: powder on a carrom board gives more friction. (a) True (b) False

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