Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 472 · 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.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 2 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a rough doormat (d) oil on a squeaky hinge
4. 4.True or false: a rough doormat gives less friction. (a) True (b) False
5. 5.True or false: sand on a slippery path gives less friction. (a) False (b) True
6. 6.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) wet (d) magnetic
7. 7.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
8. 8.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 7 N, sandpaper 10 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
10. 10.🛞 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 8 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
11. 11.True or false: a smooth steel slide gives more friction. (a) True (b) False
12. 12.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
13. 13.True or false: a grippy rubber sole gives more friction. (a) True (b) False
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 9 N, sandpaper 10 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
15. 15.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 11 N, sandpaper 13 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🛞 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 3 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
18. 18.True or false: powder on a carrom board gives more friction. (a) True (b) False
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 12 N, a carpet 13 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
20. 20.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) skating on ice (d) powder on a carrom board
21. 21.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
22. 22.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 9 N, sandpaper 11 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
24. 24.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) powder on a carrom board (d) a box pushed on carpet
25. 25.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
26. 26.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
27. 27.🛞 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 10 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 3 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
29. 29.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) sand on a slippery path (d) oil on a squeaky hinge
30. 30.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 14 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
32. 32.True or false: a rough doormat gives more friction. (a) False (b) True
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 9 N, ice 2 N, a glass sheet 5 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
34. 34.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) add sand (d) make parts rough
35. 35.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
36. 36.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
37. 37.🛞 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, a carpet 11 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
39. 39.True or false: a tyre with deep treads 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: sandpaper 9 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper

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