Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 645 · 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.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
2. 2.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a carpet 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 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 9 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 9 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
6. 6.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
7. 7.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a tyre with deep treads (d) a smooth steel slide
8. 8.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
9. 9.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
10. 10.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) skating on ice (d) a rough doormat
11. 11.🛞 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 glass sheet 5 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
12. 12.🛞 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 7 N, sandpaper 8 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
13. 13.True or false: a grippy rubber sole gives less friction. (a) True (b) False
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
15. 15.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
16. 16.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
17. 17.🛞 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, ice 2 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
18. 18.True or false: a wet tiled floor gives more friction. (a) True (b) False
19. 19.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 6 N, a carpet 7 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
21. 21.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
22. 22.True or false: a tyre with deep treads gives more 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 glass sheet 4 N, a carpet 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
25. 25.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a wet tiled floor (d) a rough doormat
26. 26.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
27. 27.True or false: a smooth steel slide gives less friction. (a) False (b) True
28. 28.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
29. 29.🛞 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 7 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 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 7 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?
33. 33.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
34. 34.True or false: a smooth steel slide gives more friction. (a) True (b) False
35. 35.True or false: chalk on a gym bar gives more friction. (a) True (b) False
36. 36.True or false: a grippy rubber sole gives more friction. (a) True (b) False
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 3 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 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 wooden plank 5 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, a carpet 13 N, ice 2 N, a glass sheet 6 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
40. 40.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a box pushed on carpet (d) powder on a carrom board

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