Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 482 · 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 13 N, ice 4 N, a glass sheet 8 N, a carpet 11 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) powder on a carrom board (d) a wet tiled floor
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, a carpet 12 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 7 N, sandpaper 11 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
6. 6.True or false: powder on a carrom board gives less friction. (a) False (b) True
7. 7.True or false: a smooth steel slide gives less friction. (a) True (b) False
8. 8.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
9. 9.🛞 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 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
10. 10.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
11. 11.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
12. 12.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
14. 14.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) sand on a slippery path (d) a smooth steel slide
15. 15.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
16. 16.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
17. 17.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) chalk on a gym bar (d) skating on ice
18. 18.🛞 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. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
19. 19.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
20. 20.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
21. 21.True or false: powder on a carrom board gives more friction. (a) True (b) False
22. 22.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
23. 23.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
25. 25.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
26. 26.True or false: a rough doormat gives less friction. (a) True (b) False
27. 27.True or false: chalk on a gym bar gives more friction. (a) True (b) False
28. 28.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 9 N, sandpaper 11 N, ice 4 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
30. 30.True or false: a rough doormat gives more friction. (a) True (b) False
31. 31.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
32. 32.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 15 N, ice 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
34. 34.True or false: sand on a slippery path gives more friction. (a) False (b) True
35. 35.True or false: chalk on a gym bar gives less friction. (a) True (b) False
36. 36.True or false: a wet tiled floor gives less friction. (a) True (b) False
37. 37.🛞 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 wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
38. 38.True or false: a smooth steel slide gives more friction. (a) True (b) False
39. 39.🛞 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 3 N, sandpaper 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
40. 40.True or false: a grippy rubber sole gives less friction. (a) True (b) False

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