Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 659 · 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.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
2. 2.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) a rough doormat (d) a box pushed on carpet
4. 4.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
5. 5.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
6. 6.🔍 Which is the odd one out? (a) a smooth steel slide (b) sand on a slippery path (c) a wet tiled floor (d) a wheel on ball bearings
7. 7.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
8. 8.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
9. 9.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a tyre with deep treads (d) oil on a squeaky hinge
10. 10.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) a rough doormat (d) a smooth steel slide
11. 11.True or false: a rough doormat gives less friction. (a) True (b) False
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, a glass sheet 1 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
13. 13.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
14. 14.True or false: powder on a carrom board gives more friction. (a) False (b) True
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on a carpet than on ice?
16. 16.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 8 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
18. 18.True or false: powder on a carrom board gives less friction. (a) False (b) True
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: a wooden plank 6 N, a carpet 9 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
21. 21.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) chalk on a gym bar (d) a tyre with deep treads
22. 22.🛞 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 glass sheet 6 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
23. 23.True or false: a box pushed on carpet gives more friction. (a) False (b) True
24. 24.True or false: chalk on a gym bar gives less friction. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) a rough doormat (d) a wheel on ball bearings
26. 26.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) skating on ice (d) chalk on a gym bar
27. 27.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a tyre with deep treads (d) powder on a carrom board
28. 28.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) powder on a carrom board (d) oil on a squeaky hinge
29. 29.True or false: chalk on a gym bar gives more friction. (a) True (b) False
30. 30.🛞 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 10 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
32. 32.True or false: a box pushed on carpet gives less friction. (a) True (b) False
33. 33.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
34. 34.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
35. 35.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
36. 36.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
37. 37.True or false: sand on a slippery path gives more friction. (a) False (b) True
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 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 6 N, sandpaper 9 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
40. 40.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful

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