Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 447 · 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: walking without slipping? (a) a problem (b) helpful
2. 2.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
3. 3.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a wooden plank 2 N, a carpet 5 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 13 N, ice 4 N, a glass sheet 8 N, a wooden plank 9 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
6. 6.True or false: sand on a slippery path gives less friction. (a) False (b) True
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 14 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
8. 8.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
9. 9.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 12 N, ice 2 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
13. 13.True or false: a box pushed on carpet gives less friction. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) oil on a squeaky hinge (d) a rough doormat
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 9 N, sandpaper 13 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
16. 16.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
17. 17.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) sand on a slippery path (d) a grippy rubber sole
18. 18.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a wooden plank 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 8 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
22. 22.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
23. 23.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
24. 24.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
25. 25.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
26. 26.True or false: a tyre with deep treads gives more friction. (a) True (b) False
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, a carpet 14 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
28. 28.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
29. 29.True or false: a smooth steel slide gives less friction. (a) True (b) False
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
31. 31.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
32. 32.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
33. 33.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
34. 34.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) a wheel on ball bearings (d) oil on a squeaky hinge
35. 35.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 11 N, ice 3 N, a glass sheet 7 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 3 N, sandpaper 4 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
39. 39.True or false: chalk on a gym bar 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 13 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 10 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet

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