Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 502 · 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 grippy rubber sole (b) powder on a carrom board (c) skating on ice (d) oil on a squeaky hinge
2. 2.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
3. 3.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) a tyre with deep treads (d) oil on a squeaky hinge
4. 4.🛞 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 10 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
6. 6.True or false: chalk on a gym bar gives less friction. (a) False (b) True
7. 7.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 13 N, ice 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
10. 10.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
11. 11.True or false: a smooth steel slide gives more friction. (a) False (b) True
12. 12.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 11 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
14. 14.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) a box pushed on carpet (d) sand on a slippery path
15. 15.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, a carpet 9 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
17. 17.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
18. 18.True or false: a grippy rubber sole gives more friction. (a) False (b) True
19. 19.True or false: chalk on a gym bar gives more friction. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a smooth steel slide (d) a wet tiled floor
21. 21.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
24. 24.True or false: powder on a carrom board gives less friction. (a) True (b) False
25. 25.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
26. 26.🛞 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 wooden plank 6 N, sandpaper 9 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
27. 27.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a wet tiled floor (d) a rough doormat
28. 28.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
29. 29.True or false: a wheel on ball bearings 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 2 N, a carpet 5 N, sandpaper 6 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: ice 1 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 8 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, ice 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
33. 33.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
34. 34.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 6 N, a wooden plank 7 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: sandpaper 9 N, ice 3 N, a glass sheet 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
38. 38.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
39. 39.🛞 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 4 N, sandpaper 6 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet

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