Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 49 · 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.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
2. 2.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
3. 3.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
4. 4.🛞 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, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) a wheel on ball bearings (d) oil on a squeaky hinge
6. 6.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) skating on ice (d) a wheel on ball bearings
7. 7.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
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, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
9. 9.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) oil on a squeaky hinge (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.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
12. 12.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) a tyre with deep treads (d) a box pushed on carpet
13. 13.True or false: a grippy rubber sole gives more 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 7 N, sandpaper 8 N, ice 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
15. 15.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
16. 16.🛞 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 7 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
17. 17.True or false: sand on a slippery path gives more friction. (a) False (b) True
18. 18.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
19. 19.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) a box pushed on carpet (d) a rough doormat
21. 21.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
22. 22.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
23. 23.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
24. 24.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
25. 25.🛞 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 6 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
27. 27.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, ice 1 N, a wooden plank 4 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
29. 29.True or false: a rough doormat gives less friction. (a) False (b) True
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 7 N, sandpaper 10 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
31. 31.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) sand on a slippery path (d) a tyre with deep treads
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 9 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (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 10 N, ice 3 N, a glass sheet 7 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
34. 34.True or false: a wet tiled floor gives less friction. (a) False (b) True
35. 35.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
36. 36.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
37. 37.True or false: powder on a carrom board 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 carpet 6 N, sandpaper 8 N, ice 4 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
39. 39.True or false: a rough doormat gives more friction. (a) False (b) True
40. 40.True or false: a tyre with deep treads gives more friction. (a) False (b) True

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