Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 440 · 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: striking a matchstick? (a) helpful (b) a problem
2. 2.🛞 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 6 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
3. 3.🛞 Friction acts … (a) with the motion (b) against the motion (c) only upwards (d) only on ice
4. 4.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) oil on a squeaky hinge (d) a grippy rubber sole
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
6. 6.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
7. 7.True or false: a box pushed on carpet gives less friction. (a) False (b) True
8. 8.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
9. 9.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
10. 10.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
11. 11.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
12. 12.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
13. 13.True or false: a rough doormat gives more friction. (a) False (b) True
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 5 N, a carpet 9 N, sandpaper 12 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
15. 15.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
16. 16.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
17. 17.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 11 N, a carpet 15 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
19. 19.True or false: a grippy rubber sole gives less friction. (a) True (b) False
20. 20.🛞 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, a carpet 9 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
21. 21.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 5 N, ice 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 10 N, sandpaper 11 N, ice 3 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 3 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🔍 Which is the odd one out? (a) a smooth steel slide (b) a tyre with deep treads (c) oil on a squeaky hinge (d) skating on ice
26. 26.🛞 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 3 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
27. 27.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 3 N, sandpaper 4 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
29. 29.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
30. 30.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) magnetic (d) wet
31. 31.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a tyre with deep treads (d) a grippy rubber sole
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 12 N, sandpaper 16 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
33. 33.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
34. 34.🛞 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 carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 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 4 N, a carpet 6 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
36. 36.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
37. 37.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (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 4 N, a wooden plank 7 N, sandpaper 11 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
40. 40.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful

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