Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 465 · 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.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
2. 2.🛞 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 7 N, a carpet 8 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
3. 3.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) powder on a carrom board (d) a wheel on ball bearings
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 1 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
5. 5.🛞 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 3 N, a glass sheet 6 N. How many newtons more were needed on a carpet than on ice?
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 11 N, sandpaper 13 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
7. 7.True or false: powder on a carrom board gives more friction. (a) True (b) False
8. 8.True or false: sand on a slippery path gives more friction. (a) False (b) True
9. 9.🔍 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
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N. How many newtons more were needed on a carpet than on ice?
11. 11.True or false: a smooth steel slide gives less friction. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a rough doormat (d) a wet tiled floor
13. 13.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
14. 14.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 9 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 4 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
18. 18.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
19. 19.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
20. 20.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) sand on a slippery path (d) a box pushed on carpet
21. 21.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
22. 22.🛞 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 7 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
23. 23.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
25. 25.True or false: a rough doormat gives less friction. (a) False (b) True
26. 26.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
27. 27.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
29. 29.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
30. 30.True or false: a rough doormat gives more friction. (a) True (b) False
31. 31.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
32. 32.True or false: a grippy rubber sole gives more friction. (a) True (b) False
33. 33.🛞 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 10 N, sandpaper 11 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
34. 34.True or false: chalk on a gym bar gives more friction. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) a tyre with deep treads (d) a wheel on ball bearings
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 4 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
37. 37.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) chalk on a gym bar (d) a wheel on ball bearings
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 8 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
39. 39.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
40. 40.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction

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