Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 380 · 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: a smooth steel slide gives more friction. (a) True (b) False
2. 2.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
3. 3.🔍 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 wheel on ball bearings
4. 4.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a rough doormat (d) a wheel on ball bearings
5. 5.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
6. 6.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
7. 7.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
8. 8.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
9. 9.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
10. 10.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
11. 11.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
12. 12.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) powder on a carrom board (d) a tyre with deep treads
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 10 N, sandpaper 12 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
15. 15.True or false: skating on ice gives more friction. (a) True (b) False
16. 16.True or false: a grippy rubber sole gives more friction. (a) True (b) False
17. 17.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
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: a glass sheet 1 N, a wooden plank 4 N, a carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
20. 20.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) a tyre with deep treads (d) chalk on a gym bar
21. 21.True or false: a box pushed on carpet gives more friction. (a) False (b) True
22. 22.🛞 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 7 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
23. 23.True or false: a wet tiled floor gives more friction. (a) True (b) False
24. 24.🛞 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 wooden plank 8 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 5 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
27. 27.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
28. 28.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
29. 29.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) sand on a slippery path (d) a grippy rubber sole
30. 30.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
31. 31.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) sand on a slippery path (d) powder on a carrom board
32. 32.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
33. 33.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
34. 34.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
35. 35.True or false: powder on a carrom board gives more friction. (a) False (b) True
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 10 N, a carpet 11 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, ice 2 N, a glass sheet 6 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
38. 38.True or false: chalk on a gym bar gives more friction. (a) False (b) True
39. 39.True or false: a grippy rubber sole gives less friction. (a) True (b) False
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 7 N, a glass sheet 2 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet

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