Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 90 · 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.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) a wheel on ball bearings (d) a box pushed on carpet
2. 2.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
3. 3.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a smooth steel slide (d) a grippy rubber sole
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
5. 5.True or false: a box pushed on carpet gives more friction. (a) False (b) True
6. 6.True or false: skating on ice gives less friction. (a) True (b) False
7. 7.True or false: a wet tiled floor gives less friction. (a) True (b) False
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) polished marble (d) ice
9. 9.🔍 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
10. 10.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
11. 11.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
12. 12.🛞 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 8 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 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 3 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
14. 14.True or false: a tyre with deep treads gives less friction. (a) True (b) False
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 13 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
16. 16.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
17. 17.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
18. 18.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
19. 19.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
20. 20.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) press parts harder (d) make parts rough
21. 21.True or false: sand on a slippery path gives more friction. (a) False (b) True
22. 22.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 8 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 9 N, a glass sheet 2 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
26. 26.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) sand on a slippery path (d) oil on a squeaky hinge
27. 27.True or false: a grippy rubber sole gives more friction. (a) False (b) True
28. 28.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
29. 29.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) a box pushed on carpet (d) powder on a carrom board
30. 30.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
31. 31.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) chalk on a gym bar (d) a wet tiled floor
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 2 N, a glass sheet 5 N, a wooden plank 8 N. How many newtons more were needed on a carpet than on ice?
33. 33.True or false: chalk on a gym bar gives less friction. (a) False (b) True
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 4 N, a glass sheet 8 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
36. 36.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
37. 37.True or false: a box pushed on carpet 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: sandpaper 7 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
39. 39.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
40. 40.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful

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