Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 194 · 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.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
2. 2.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
3. 3.🛞 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, sandpaper 7 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
4. 4.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
5. 5.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
6. 6.True or false: chalk on a gym bar gives more friction. (a) False (b) True
7. 7.True or false: chalk on a gym bar gives less friction. (a) False (b) True
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
9. 9.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) a box pushed on carpet (d) sand on a slippery path
10. 10.🛞 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 9 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
11. 11.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
12. 12.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) chalk on a gym bar (d) sand on a slippery path
13. 13.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
14. 14.🛞 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 11 N, sandpaper 12 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
15. 15.🛞 More or less friction: skating on ice? (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 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 9 N, ice 2 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
18. 18.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
21. 21.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a grippy rubber sole (d) oil on a squeaky hinge
22. 22.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 2 N, a carpet 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 6 N, sandpaper 9 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 9 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, ice 2 N, a glass sheet 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
28. 28.True or false: a box pushed on carpet gives less friction. (a) False (b) True
29. 29.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) wet (d) magnetic
30. 30.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
31. 31.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
32. 32.🛞 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, a carpet 11 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
33. 33.🛞 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 carpet 4 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 3 N, a glass sheet 4 N, a wooden plank 8 N. How many newtons more were needed on a carpet than on ice?
35. 35.True or false: a rough doormat gives more friction. (a) False (b) True
36. 36.True or false: sand on a slippery path gives more friction. (a) False (b) True
37. 37.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, ice 1 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 6 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet

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