Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 487 · 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) a grippy rubber sole (b) oil on a squeaky hinge (c) skating on ice (d) powder on a carrom board
2. 2.True or false: a rough doormat gives more friction. (a) False (b) True
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
5. 5.True or false: a rough doormat gives less friction. (a) True (b) False
6. 6.🛞 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 9 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
7. 7.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) a rough doormat (d) a grippy rubber sole
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, a carpet 12 N, ice 4 N, a glass sheet 7 N. How many newtons more were needed on a carpet than on ice?
9. 9.True or false: chalk on a gym bar gives more friction. (a) False (b) True
10. 10.True or false: a tyre with deep treads gives more friction. (a) True (b) False
11. 11.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
12. 12.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
14. 14.🛞 Friction acts … (a) against the motion (b) only upwards (c) only on ice (d) with the motion
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, ice 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
16. 16.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) a grippy rubber sole (d) a rough doormat
17. 17.🛞 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 6 N, a carpet 7 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
18. 18.🛞 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 6 N, a carpet 8 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
19. 19.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
20. 20.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) a wet tiled floor (d) powder on a carrom board
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
22. 22.True or false: a box pushed on carpet gives more friction. (a) False (b) True
23. 23.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
25. 25.🛞 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 12 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
27. 27.True or false: powder on a carrom board gives more friction. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) a wet tiled floor (d) a tyre with deep treads
29. 29.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
30. 30.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
31. 31.True or false: sand on a slippery path gives less friction. (a) False (b) True
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 9 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 More or less friction: a smooth steel slide? (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 glass sheet 4 N, a wooden plank 5 N, a carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
35. 35.🛞 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 carpet 11 N, sandpaper 12 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
36. 36.True or false: a wet tiled floor gives more friction. (a) False (b) True
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
38. 38.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
39. 39.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
40. 40.🛞 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, a carpet 9 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank

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