Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 523 · 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.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
3. 3.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) glass (d) sandpaper
5. 5.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
6. 6.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
7. 7.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
8. 8.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) oil on a squeaky hinge (d) a grippy rubber sole
9. 9.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 6 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
12. 12.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
14. 14.🛞 Friction acts … (a) only upwards (b) only on ice (c) against the motion (d) with the motion
15. 15.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
16. 16.True or false: a rough doormat gives more friction. (a) False (b) True
17. 17.True or false: sand on a slippery path gives more friction. (a) True (b) False
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 10 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
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 5 N, a carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
20. 20.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) powder on a carrom board (d) a rough doormat
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
22. 22.🛞 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 9 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 10 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
27. 27.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) chalk on a gym bar (d) sand on a slippery path
28. 28.🛞 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 8 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
29. 29.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a tyre with deep treads (d) skating on ice
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 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. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 7 N, sandpaper 11 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
34. 34.🛞 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 6 N, a carpet 8 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
35. 35.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
36. 36.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
37. 37.True or false: a rough doormat gives less friction. (a) True (b) False
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 9 N, ice 2 N, a glass sheet 4 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 5 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 3 N, sandpaper 6 N, ice 1 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet

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