Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 284 · 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: sandpaper 10 N, ice 3 N, a glass sheet 6 N, a carpet 8 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
2. 2.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a box pushed on carpet (d) a wet tiled floor
3. 3.🛞 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 7 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
4. 4.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) press parts harder (d) add sand
5. 5.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 3 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
7. 7.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
8. 8.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
9. 9.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
10. 10.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) sand on a slippery path (d) skating on ice
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
12. 12.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
13. 13.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
14. 14.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
15. 15.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) chalk on a gym bar (d) oil on a squeaky hinge
16. 16.True or false: a grippy rubber sole gives less friction. (a) False (b) True
17. 17.🛞 More or less friction: a wet tiled floor? (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: a carpet 9 N, ice 1 N, a glass sheet 4 N, a wooden plank 8 N. How many newtons more were needed on a carpet than on ice?
20. 20.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
21. 21.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
22. 22.True or false: sand on a slippery path gives less friction. (a) True (b) False
23. 23.🛞 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. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) wet (d) cold
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 8 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
27. 27.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
28. 28.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a wet tiled floor (d) chalk on a gym bar
29. 29.🛞 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 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
30. 30.🛞 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 10 N, sandpaper 12 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
31. 31.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
32. 32.🛞 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, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
33. 33.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) a wet tiled floor (d) a grippy rubber sole
34. 34.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 2 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
36. 36.🛞 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 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
37. 37.🛞 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 4 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
38. 38.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a smooth steel slide (c) a box pushed on carpet (d) a grippy rubber sole
39. 39.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) a rough doormat (d) chalk on a gym bar
40. 40.🛞 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 carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet

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