Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 608 · 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) a box pushed on carpet (b) a rough doormat (c) a smooth steel slide (d) sand on a slippery path
2. 2.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
3. 3.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
4. 4.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 4 N, ice 1 N, a glass sheet 2 N, a carpet 3 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
6. 6.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wet tiled floor (c) a grippy rubber sole (d) chalk on a gym bar
7. 7.🛞 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 7 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
10. 10.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
11. 11.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
12. 12.🛞 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 carpet 9 N, sandpaper 11 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
16. 16.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
17. 17.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 4 N, a glass sheet 7 N, a wooden plank 8 N. How many newtons more were needed on a carpet than on ice?
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 8 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
20. 20.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
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 most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
22. 22.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
23. 23.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) a tyre with deep treads (d) skating on ice
24. 24.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
25. 25.True or false: a box pushed on carpet gives more friction. (a) False (b) True
26. 26.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
29. 29.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) chalk on a gym bar (d) a rough doormat
30. 30.True or false: a wet tiled floor gives more friction. (a) True (b) False
31. 31.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
32. 32.🛞 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. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 2 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
34. 34.True or false: skating on ice gives more friction. (a) False (b) True
35. 35.🛞 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 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
36. 36.🛞 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. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
38. 38.True or false: sand on a slippery path gives more friction. (a) True (b) False
39. 39.True or false: sand on a slippery path gives less friction. (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) skating on ice (d) chalk on a gym bar

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