Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 567 · 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: a wooden plank 7 N, a carpet 9 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
2. 2.🛞 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, a carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
3. 3.True or false: a wet tiled floor gives more friction. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) chalk on a gym bar (d) a smooth steel slide
5. 5.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
6. 6.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) ice (d) glass
7. 7.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
8. 8.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) powder on a carrom board (d) oil on a squeaky hinge
9. 9.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a tyre with deep treads (d) chalk on a gym bar
10. 10.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
11. 11.True or false: a box pushed on carpet gives more friction. (a) True (b) False
12. 12.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 8 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
14. 14.True or false: skating on ice gives less friction. (a) False (b) True
15. 15.True or false: a tyre with deep treads gives more friction. (a) False (b) True
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 10 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
17. 17.🛞 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 13 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
18. 18.True or false: powder on a carrom board gives more friction. (a) True (b) False
19. 19.True or false: a box pushed on carpet gives less friction. (a) False (b) True
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 16 N, ice 4 N, a glass sheet 8 N, a wooden plank 12 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
22. 22.🛞 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, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
23. 23.True or false: skating on ice gives more friction. (a) True (b) False
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
25. 25.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) chalk on a gym bar (d) a box pushed on carpet
26. 26.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
27. 27.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 7 N, sandpaper 11 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
29. 29.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
31. 31.True or false: chalk on a gym bar gives less friction. (a) True (b) False
32. 32.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
33. 33.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
34. 34.True or false: a wet tiled floor gives less friction. (a) True (b) False
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 8 N, a carpet 11 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
36. 36.True or false: a grippy rubber sole gives less friction. (a) False (b) True
37. 37.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) a wheel on ball bearings (d) a wet tiled floor
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, sandpaper 12 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 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?
40. 40.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction

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