Engineering Worksheet: Friction

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

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