Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 395 · 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 carpet 8 N, sandpaper 12 N, ice 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
2. 2.True or false: skating on ice gives less friction. (a) False (b) True
3. 3.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 11 N, sandpaper 14 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
5. 5.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, sandpaper 11 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
7. 7.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
8. 8.True or false: sand on a slippery path gives less friction. (a) False (b) True
9. 9.🛞 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 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) a wet tiled floor (d) sand on a slippery path
11. 11.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
12. 12.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
13. 13.🛞 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. How many newtons more were needed on sandpaper than on a glass sheet?
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, sandpaper 7 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
15. 15.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
16. 16.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
17. 17.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
18. 18.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) a grippy rubber sole (d) a smooth steel slide
19. 19.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
21. 21.True or false: a box pushed on carpet gives less friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 10 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 7 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
24. 24.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
25. 25.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
26. 26.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
27. 27.🛞 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 most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
28. 28.🛞 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 6 N, a carpet 10 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
29. 29.🛞 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 12 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 2 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, sandpaper 14 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
32. 32.🛞 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, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 9 N, ice 4 N, a glass sheet 5 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
34. 34.True or false: chalk on a gym bar gives less friction. (a) True (b) False
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 9 N, sandpaper 13 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
36. 36.True or false: chalk on a gym bar gives more friction. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) sand on a slippery path (d) a wheel on ball bearings
38. 38.True or false: powder on a carrom board gives less friction. (a) True (b) False
39. 39.🛞 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 5 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
40. 40.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) oil on a squeaky hinge (d) sand on a slippery path

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