Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 341 · 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.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
3. 3.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
4. 4.True or false: a wet tiled floor gives less friction. (a) False (b) True
5. 5.🛞 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, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 4 N, a carpet 6 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
7. 7.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
8. 8.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
9. 9.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
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 6 N, a carpet 10 N, sandpaper 12 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
11. 11.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 2 N, a wooden plank 3 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
13. 13.🛞 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 4 N, a carpet 5 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
14. 14.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 6 N, a carpet 10 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
16. 16.True or false: skating on ice gives more friction. (a) False (b) True
17. 17.True or false: a rough doormat gives less friction. (a) False (b) True
18. 18.True or false: a wet tiled floor gives more friction. (a) False (b) True
19. 19.True or false: powder on a carrom board gives less friction. (a) False (b) True
20. 20.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
21. 21.True or false: sand on a slippery path gives less friction. (a) True (b) False
22. 22.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
23. 23.🛞 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, a carpet 8 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
24. 24.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
25. 25.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
26. 26.🛞 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, sandpaper 9 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
27. 27.🛞 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 10 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.True or false: a tyre with deep treads gives less friction. (a) True (b) False
29. 29.True or false: skating on ice gives less friction. (a) True (b) False
30. 30.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
31. 31.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
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 6 N, a carpet 10 N, ice 3 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: a carpet 6 N, sandpaper 8 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
34. 34.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
35. 35.🛞 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 4 N. How many newtons more were needed on sandpaper than on ice?
36. 36.True or false: a tyre with deep treads gives more friction. (a) False (b) True
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 5 N, a wooden plank 8 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
38. 38.True or false: a smooth steel slide gives less friction. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 10 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
40. 40.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) a wheel on ball bearings (d) a rough doormat

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