Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 902 · 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 box pushed on carpet (b) a grippy rubber sole (c) a rough doormat (d) powder on a carrom board
2. 2.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
3. 3.True or false: a box pushed on carpet gives more friction. (a) True (b) False
4. 4.True or false: a rough doormat gives more friction. (a) False (b) True
5. 5.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
6. 6.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
7. 7.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
8. 8.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) a wet tiled floor (d) a tyre with deep treads
9. 9.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
11. 11.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) sand on a slippery path (d) a grippy rubber sole
12. 12.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
13. 13.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) sand on a slippery path (d) powder on a carrom board
14. 14.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) a grippy rubber sole (d) a wet tiled floor
15. 15.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
16. 16.True or false: a rough doormat gives less friction. (a) False (b) True
17. 17.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
18. 18.True or false: a smooth steel slide gives less friction. (a) True (b) False
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 4 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 5 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
23. 23.True or false: a smooth steel slide gives more friction. (a) True (b) False
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 14 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
27. 27.True or false: a tyre with deep treads gives less friction. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) a grippy rubber sole (d) powder on a carrom board
29. 29.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
30. 30.🛞 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 8 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a glass sheet 6 N, a carpet 9 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
32. 32.True or false: powder on a carrom board gives less friction. (a) False (b) True
33. 33.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
34. 34.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
35. 35.True or false: sand on a slippery path gives less friction. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) chalk on a gym bar (d) a rough doormat
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, sandpaper 11 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 4 N, sandpaper 7 N, a glass sheet 1 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
39. 39.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 6 N, sandpaper 9 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet

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