Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 980 · 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) sand on a slippery path (c) a box pushed on carpet (d) skating on ice
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, ice 1 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
3. 3.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
4. 4.🛞 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?
5. 5.True or false: a rough doormat gives less friction. (a) False (b) True
6. 6.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
7. 7.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
8. 8.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
9. 9.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
10. 10.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
11. 11.🔍 Which is the odd one out? (a) powder on a carrom board (b) a tyre with deep treads (c) a box pushed on carpet (d) chalk on a gym bar
12. 12.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
13. 13.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) a rough doormat (d) a grippy rubber sole
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 8 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, sandpaper 7 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
19. 19.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
20. 20.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
21. 21.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
23. 23.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
26. 26.True or false: a tyre with deep treads gives less friction. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) powder on a carrom board (d) a wet tiled floor
28. 28.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 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
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 13 N, ice 3 N, a glass sheet 7 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
31. 31.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) make parts rough (d) press parts harder
32. 32.True or false: a wet tiled floor gives less friction. (a) True (b) False
33. 33.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
34. 34.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) a wet tiled floor (d) a rough doormat
35. 35.🛞 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 13 N, a glass sheet 1 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
36. 36.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a box pushed on carpet
37. 37.True or false: powder on a carrom board gives more friction. (a) False (b) True
38. 38.True or false: a box pushed on carpet gives less friction. (a) True (b) False
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
40. 40.True or false: a box pushed on carpet gives more friction. (a) True (b) False

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