Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 526 · 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.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
2. 2.True or false: a wet tiled floor gives less friction. (a) False (b) True
3. 3.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
4. 4.True or false: a grippy rubber sole gives less friction. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) powder on a carrom board (d) a wet tiled floor
6. 6.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
7. 7.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 7 N, sandpaper 11 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
9. 9.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 1 N, a glass sheet 5 N, a wooden plank 9 N. How many newtons more were needed on sandpaper than on ice?
11. 11.True or false: a tyre with deep treads gives less friction. (a) False (b) True
12. 12.🛞 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 least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
13. 13.True or false: powder on a carrom board gives less friction. (a) True (b) False
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, ice 3 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
16. 16.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
17. 17.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
18. 18.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 10 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
21. 21.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
22. 22.True or false: powder on a carrom board gives more friction. (a) True (b) False
23. 23.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 6 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
25. 25.🛞 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) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
26. 26.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
27. 27.True or false: a smooth steel slide gives more friction. (a) True (b) False
28. 28.True or false: sand on a slippery path gives less friction. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a grippy rubber sole (d) oil on a squeaky hinge
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
33. 33.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
34. 34.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) sand on a slippery path (d) oil on a squeaky hinge
35. 35.🛞 More or less friction: a tyre with deep treads? (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 glass sheet 4 N, a wooden plank 7 N, a carpet 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on a glass sheet?
37. 37.True or false: a rough doormat gives less friction. (a) False (b) True
38. 38.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
40. 40.🛞 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 8 N, sandpaper 12 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper

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