Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 198 · 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, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
2. 2.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
3. 3.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
4. 4.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
5. 5.True or false: a wet tiled floor gives more friction. (a) False (b) True
6. 6.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
7. 7.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) powder on a carrom board (d) a rough doormat
8. 8.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) sand on a slippery path (d) a box pushed on carpet
9. 9.True or false: a rough doormat gives more friction. (a) False (b) True
10. 10.True or false: a grippy rubber sole gives more friction. (a) False (b) True
11. 11.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, sandpaper 7 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
13. 13.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) oil on a squeaky hinge (d) chalk on a gym bar
15. 15.🛞 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 10 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
16. 16.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
17. 17.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
18. 18.🛞 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, a carpet 11 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 9 N, ice 4 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
21. 21.True or false: a smooth steel slide gives more friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 3 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
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 9 N, a glass sheet 2 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
24. 24.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) a rough doormat (d) a grippy rubber sole
25. 25.True or false: powder on a carrom board gives less friction. (a) False (b) True
26. 26.🛞 More or less friction: skating on ice? (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 carpet 10 N, ice 4 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
28. 28.True or false: a box pushed on carpet gives less friction. (a) True (b) False
29. 29.True or false: a tyre with deep treads gives more friction. (a) False (b) True
30. 30.🛞 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 carpet 10 N, sandpaper 11 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
32. 32.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
33. 33.🛞 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, a carpet 11 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
34. 34.🛞 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 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 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, ice 1 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 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 10 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
39. 39.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet

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