Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 379 · 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 9 N, ice 2 N, a glass sheet 4 N, a carpet 7 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a carpet 10 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 7 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
5. 5.True or false: powder on a carrom board gives more friction. (a) True (b) False
6. 6.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
7. 7.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
8. 8.True or false: a box pushed on carpet gives less friction. (a) True (b) False
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 10 N, sandpaper 13 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
10. 10.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) wet (d) cold
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
12. 12.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
13. 13.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
14. 14.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
16. 16.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 5 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
18. 18.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
19. 19.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
21. 21.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) a rough doormat (d) a box pushed on carpet
22. 22.🛞 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 5 N, sandpaper 9 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a glass sheet 4 N, a carpet 7 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
24. 24.🛞 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, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
26. 26.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 6 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 3 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
30. 30.🛞 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 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
32. 32.🛞 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 4 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
33. 33.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 4 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 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 6 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
36. 36.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) chalk on a gym bar (d) a grippy rubber sole
38. 38.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a rough doormat (d) skating on ice
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 11 N, sandpaper 14 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 More or less friction: skating on ice? (a) more friction (b) less friction

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