Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 210 · 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: powder on a carrom board gives less friction. (a) True (b) False
2. 2.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
3. 3.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 9 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
5. 5.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 1 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 7 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 8 N, sandpaper 12 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
9. 9.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
10. 10.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
11. 11.🛞 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 10 N, ice 4 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
12. 12.🛞 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 10 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
13. 13.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) skating on ice (d) a grippy rubber sole
14. 14.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 9 N, ice 3 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 11 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
17. 17.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
18. 18.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
19. 19.🛞 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 most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
20. 20.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) a tyre with deep treads (d) a grippy rubber sole
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 7 N, sandpaper 10 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, sandpaper 9 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
23. 23.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) a rough doormat (d) a box pushed on carpet
24. 24.True or false: a smooth steel slide gives more friction. (a) False (b) True
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
26. 26.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
27. 27.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) a smooth steel slide (d) powder on a carrom board
29. 29.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
30. 30.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
31. 31.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
32. 32.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
33. 33.True or false: a box pushed on carpet gives more friction. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) a grippy rubber sole (d) a tyre with deep treads
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 6 N, sandpaper 9 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
36. 36.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wheel on ball bearings (c) a rough doormat (d) a box pushed on carpet
37. 37.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
38. 38.True or false: a box pushed on carpet gives less friction. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, ice 2 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction

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