Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 195 · 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) more friction (b) less friction
2. 2.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, sandpaper 10 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
4. 4.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 11 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
6. 6.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
8. 8.True or false: chalk on a gym bar gives less friction. (a) True (b) False
9. 9.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
10. 10.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
11. 11.🛞 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 7 N, sandpaper 11 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
12. 12.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
13. 13.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) sand on a slippery path (d) skating on ice
14. 14.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
15. 15.True or false: sand on a slippery path gives more friction. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) a wheel on ball bearings (d) sand on a slippery path
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 2 N, a glass sheet 5 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
19. 19.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) skating on ice (d) a smooth steel slide
20. 20.True or false: a box pushed on carpet gives less friction. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) sand on a slippery path (d) a tyre with deep treads
22. 22.True or false: skating on ice gives less friction. (a) True (b) False
23. 23.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 4 N, sandpaper 6 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
25. 25.True or false: a wet tiled floor gives less friction. (a) False (b) True
26. 26.🛞 More or less friction: a rough doormat? (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 wooden plank 7 N, sandpaper 9 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
29. 29.True or false: a box pushed on carpet gives more friction. (a) False (b) True
30. 30.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
31. 31.True or false: sand on a slippery path gives less friction. (a) True (b) False
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 9 N, sandpaper 11 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
33. 33.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
34. 34.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
36. 36.True or false: a rough doormat gives less friction. (a) True (b) False
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
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 8 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet

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