Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 455 · 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 wooden plank 5 N, a carpet 9 N, sandpaper 10 N, a glass sheet 1 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 1 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
3. 3.🛞 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, a carpet 12 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
4. 4.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 6 N, sandpaper 9 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
6. 6.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
7. 7.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
8. 8.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
9. 9.True or false: skating on ice gives less friction. (a) True (b) False
10. 10.🛞 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 11 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
11. 11.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 10 N, ice 4 N, a glass sheet 7 N. How many newtons more were needed on sandpaper than on ice?
13. 13.True or false: a grippy rubber sole gives more friction. (a) False (b) True
14. 14.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
15. 15.🛞 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 9 N, sandpaper 13 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
16. 16.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) a grippy rubber sole (d) a box pushed on carpet
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 3 N, sandpaper 7 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
19. 19.True or false: a smooth steel slide gives more friction. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) a rough doormat (d) powder on a carrom board
21. 21.True or false: sand on a slippery path gives more friction. (a) True (b) False
22. 22.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
23. 23.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) oil on a squeaky hinge (d) powder on a carrom board
24. 24.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
25. 25.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
26. 26.True or false: a tyre with deep treads gives less friction. (a) False (b) True
27. 27.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
28. 28.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
29. 29.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
31. 31.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
32. 32.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
33. 33.True or false: powder on a carrom board gives more friction. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a tyre with deep treads (d) a smooth steel slide
35. 35.True or false: powder on a carrom board gives less friction. (a) True (b) False
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 8 N, a carpet 9 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
37. 37.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) skating on ice (d) a box pushed on carpet
38. 38.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
39. 39.🛞 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 9 N, a carpet 12 N. How many newtons more were needed on a carpet than on ice?
40. 40.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction

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