Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 156 · 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) powder on a carrom board (b) a rough doormat (c) a grippy rubber sole (d) a tyre with deep treads
2. 2.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) skating on ice (d) oil on a squeaky hinge
3. 3.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
4. 4.🛞 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 7 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
5. 5.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
6. 6.True or false: a grippy rubber sole gives more friction. (a) True (b) False
7. 7.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
8. 8.True or false: a tyre with deep treads gives less friction. (a) True (b) False
9. 9.🛞 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 carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
10. 10.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
11. 11.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
12. 12.True or false: a box pushed on carpet gives less friction. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) sand on a slippery path (d) oil on a squeaky hinge
14. 14.True or false: a rough doormat gives less friction. (a) False (b) True
15. 15.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) polished marble (d) glass
16. 16.🛞 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 carpet 9 N, sandpaper 12 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 8 N, ice 2 N, a glass sheet 5 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
18. 18.True or false: sand on a slippery path gives more friction. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) sand on a slippery path (d) a box pushed on carpet
20. 20.🛞 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 6 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
21. 21.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) cold (d) warm
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 9 N, sandpaper 10 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
23. 23.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
24. 24.True or false: a smooth steel slide gives less friction. (a) False (b) True
25. 25.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
26. 26.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
27. 27.True or false: powder on a carrom board gives more friction. (a) True (b) False
28. 28.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
29. 29.🛞 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 carpet 10 N, sandpaper 11 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
30. 30.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
32. 32.True or false: a grippy rubber sole gives less friction. (a) True (b) False
33. 33.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) skating on ice (d) a box pushed on carpet
35. 35.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
36. 36.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
37. 37.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
38. 38.True or false: skating on ice gives more friction. (a) False (b) True
39. 39.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
40. 40.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction

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