Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 399 · 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: sand on a slippery path gives more friction. (a) False (b) True
2. 2.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
3. 3.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) a grippy rubber sole (d) a wheel on ball bearings
4. 4.🛞 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 8 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 8 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
6. 6.True or false: skating on ice gives less friction. (a) True (b) False
7. 7.True or false: powder on a carrom board gives more friction. (a) True (b) False
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 4 N, sandpaper 5 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
9. 9.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
10. 10.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
11. 11.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
12. 12.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a rough doormat (d) powder on a carrom board
13. 13.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
14. 14.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 1 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
17. 17.True or false: a box pushed on carpet gives more friction. (a) True (b) False
18. 18.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
19. 19.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) a wet tiled floor (d) powder on a carrom board
20. 20.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
21. 21.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 10 N, ice 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
23. 23.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on a carpet than on ice?
25. 25.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
26. 26.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
27. 27.True or false: skating on ice gives more friction. (a) True (b) False
28. 28.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 2 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 10 N, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
31. 31.True or false: a grippy rubber sole gives less friction. (a) True (b) False
32. 32.True or false: chalk on a gym bar gives more friction. (a) True (b) False
33. 33.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 6 N, ice 1 N, a wooden plank 2 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 11 N, sandpaper 14 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 14 N, ice 4 N, a glass sheet 7 N, a wooden plank 11 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
37. 37.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
38. 38.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 2 N, a wooden plank 4 N. Which surface gave the least 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: a glass sheet 4 N, a wooden plank 7 N, sandpaper 8 N, ice 3 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank

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