Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 99 · 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.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a grippy rubber sole (d) skating on ice
2. 2.True or false: a box pushed on carpet gives less friction. (a) True (b) False
3. 3.True or false: chalk on a gym bar gives less friction. (a) False (b) True
4. 4.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
5. 5.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
6. 6.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
8. 8.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) a rough doormat (d) powder on a carrom board
9. 9.True or false: a smooth steel slide gives less friction. (a) True (b) False
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
11. 11.🛞 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 8 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) sand on a slippery path (d) a wet tiled floor
14. 14.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
16. 16.True or false: a box pushed on carpet gives more friction. (a) False (b) True
17. 17.🛞 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 least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
19. 19.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
20. 20.🛞 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, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 2 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, sandpaper 13 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
24. 24.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
25. 25.🛞 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 most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
26. 26.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
27. 27.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
28. 28.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
29. 29.True or false: sand on a slippery path gives less friction. (a) False (b) True
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 3 N, a glass sheet 7 N, a wooden plank 10 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
31. 31.True or false: a wet tiled floor gives less friction. (a) True (b) False
32. 32.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) cold (d) wet
33. 33.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 10 N, ice 4 N, a glass sheet 8 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
35. 35.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, a carpet 8 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
38. 38.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 11 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 10 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?

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