Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 638 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, a glass sheet 1 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
3. 3.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
5. 5.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
6. 6.True or false: sand on a slippery path gives more friction. (a) False (b) True
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 7 N, sandpaper 11 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
8. 8.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) powder on a carrom board (d) a grippy rubber sole
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) a smooth steel slide (d) powder on a carrom board
11. 11.True or false: a rough doormat gives more friction. (a) False (b) True
12. 12.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
13. 13.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
15. 15.True or false: a wet tiled floor gives more friction. (a) True (b) False
16. 16.🔍 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 smooth steel slide
17. 17.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) cold (d) magnetic
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
19. 19.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 12 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
21. 21.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
22. 22.🛞 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 5 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 5 N, sandpaper 8 N, a glass sheet 1 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
24. 24.True or false: a rough doormat gives less friction. (a) False (b) True
25. 25.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
26. 26.🛞 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 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
27. 27.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
28. 28.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to save rubber (d) to go slower
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
30. 30.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
31. 31.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
33. 33.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
36. 36.True or false: chalk on a gym bar gives more friction. (a) True (b) False
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 3 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
38. 38.True or false: a wet tiled floor gives less friction. (a) True (b) False
39. 39.True or false: chalk on a gym bar gives less friction. (a) False (b) True
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?

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