Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 188 · 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 smooth steel slide? (a) more friction (b) less friction
2. 2.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) a rough doormat (d) a wet tiled floor
3. 3.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) a wheel on ball bearings (d) a grippy rubber sole
4. 4.True or false: chalk on a gym bar gives more friction. (a) False (b) True
5. 5.🛞 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 4 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
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 7 N, sandpaper 8 N, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 8 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 2 N, a carpet 4 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 3 N, sandpaper 4 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
12. 12.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) magnetic (d) wet
13. 13.True or false: a tyre with deep treads gives less friction. (a) False (b) True
14. 14.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
15. 15.True or false: a grippy rubber sole gives less friction. (a) True (b) False
16. 16.True or false: a smooth steel slide gives more friction. (a) False (b) True
17. 17.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
18. 18.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 5 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 3 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 5 N, sandpaper 7 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, a glass sheet 1 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
24. 24.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
25. 25.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) a tyre with deep treads (d) powder on a carrom board
26. 26.🛞 Friction acts … (a) only on ice (b) against the motion (c) only upwards (d) with the motion
27. 27.🛞 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. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 2 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
30. 30.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) skating on ice (d) oil on a squeaky hinge
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 4 N, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 7 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, ice 3 N, a glass sheet 7 N, a carpet 11 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
34. 34.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
37. 37.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
38. 38.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 13 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 4 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper

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