Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 126 · 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 glass sheet 7 N, a wooden plank 8 N, sandpaper 12 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) glass (d) sandpaper
5. 5.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
6. 6.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
7. 7.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 10 N, ice 3 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
9. 9.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 6 N, a carpet 10 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
11. 11.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
12. 12.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
13. 13.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to go slower (d) to look nice
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 7 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 8 N, ice 4 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
16. 16.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) sand on a slippery path (d) a smooth steel slide
17. 17.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
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: sandpaper 11 N, ice 1 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
20. 20.🛞 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 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 5 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 8 N, ice 4 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
23. 23.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 7 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 9 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
27. 27.True or false: a smooth steel slide gives less friction. (a) False (b) True
28. 28.🛞 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 6 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
30. 30.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) oil on a squeaky hinge (d) a grippy rubber sole
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 10 N, ice 4 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 4 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
34. 34.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a wheel on ball bearings (d) a grippy rubber sole
35. 35.True or false: chalk on a gym bar gives less friction. (a) False (b) True
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 10 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
37. 37.True or false: a box pushed on carpet gives less friction. (a) False (b) True
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
39. 39.🛞 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 12 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 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 5 N. How many newtons more were needed on sandpaper than on ice?

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