Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 387 · 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 wooden plank 7 N, a carpet 11 N, sandpaper 13 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
2. 2.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
3. 3.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
4. 4.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
5. 5.True or false: a grippy rubber sole gives less friction. (a) True (b) False
6. 6.🛞 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 9 N, a glass sheet 3 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 4 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
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 carpet 6 N, sandpaper 10 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, sandpaper 11 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 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, sandpaper 8 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
12. 12.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
13. 13.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
14. 14.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
15. 15.🛞 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 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 13 N, ice 3 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
17. 17.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
18. 18.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
19. 19.🛞 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 7 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
20. 20.True or false: a smooth steel slide gives more friction. (a) True (b) False
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
22. 22.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) a box pushed on carpet (d) a smooth steel slide
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, sandpaper 14 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
24. 24.🛞 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 9 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 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 5 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
26. 26.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
27. 27.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) chalk on a gym bar (d) a wheel on ball bearings
28. 28.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
29. 29.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
30. 30.🛞 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 3 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) a smooth steel slide (d) a grippy rubber sole
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 13 N, ice 3 N, a glass sheet 7 N, a wooden plank 9 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
33. 33.🔍 Which is the odd one out? (a) a smooth steel slide (b) a box pushed on carpet (c) a rough doormat (d) chalk on a gym bar
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 4 N, sandpaper 5 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
35. 35.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
37. 37.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) a tyre with deep treads (d) a grippy rubber sole
38. 38.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
39. 39.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
40. 40.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction

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