Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 50 · 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) less friction (b) more friction
2. 2.True or false: a smooth steel slide gives more friction. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a rough doormat (d) powder on a carrom board
4. 4.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) skating on ice (d) a box pushed on carpet
5. 5.True or false: a box pushed on carpet gives more friction. (a) False (b) True
6. 6.True or false: powder on a carrom board gives more friction. (a) True (b) False
7. 7.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
8. 8.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
9. 9.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
10. 10.🛞 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 8 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) chalk on a gym bar (d) skating on ice
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, a carpet 9 N, ice 4 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a glass sheet 4 N, a carpet 8 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
14. 14.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand
15. 15.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
16. 16.🛞 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, sandpaper 12 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 13 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 10 N, sandpaper 13 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
20. 20.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) skating on ice (d) chalk on a gym bar
21. 21.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
22. 22.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
23. 23.True or false: powder on a carrom board gives less friction. (a) True (b) False
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 4 N, sandpaper 6 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
25. 25.True or false: a rough doormat gives more friction. (a) False (b) True
26. 26.True or false: chalk on a gym bar gives less friction. (a) True (b) False
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
28. 28.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
29. 29.True or false: skating on ice 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 1 N, a wooden plank 3 N, a carpet 5 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
33. 33.True or false: a rough doormat gives less friction. (a) True (b) False
34. 34.True or false: a grippy rubber sole gives less friction. (a) True (b) False
35. 35.🛞 Friction acts … (a) only on ice (b) only upwards (c) with the motion (d) against the motion
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 8 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
37. 37.True or false: a wet tiled floor 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, ice 3 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
39. 39.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
40. 40.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful

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