Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 375 · 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: oil on a squeaky hinge? (a) less friction (b) more friction
2. 2.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
3. 3.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a wet tiled floor (d) sand on a slippery path
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 10 N, a glass sheet 1 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
5. 5.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
6. 6.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
7. 7.True or false: a wet tiled floor gives less friction. (a) True (b) False
8. 8.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
9. 9.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) sand on a slippery path (d) a tyre with deep treads
10. 10.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
11. 11.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) a grippy rubber sole (d) a tyre with deep treads
12. 12.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
13. 13.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) cold (d) magnetic
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 10 N, a glass sheet 3 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
15. 15.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
16. 16.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
17. 17.🛞 More or less friction: a grippy rubber sole? (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 4 N, a wooden plank 5 N, sandpaper 6 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 10 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
22. 22.🛞 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 6 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
23. 23.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) skating on ice (d) a tyre with deep treads
24. 24.🛞 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 6 N, a wooden plank 9 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
25. 25.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
26. 26.🛞 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 4 N, sandpaper 8 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
27. 27.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, sandpaper 9 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
29. 29.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
30. 30.True or false: a box pushed on carpet gives more friction. (a) False (b) True
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 10 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
33. 33.True or false: a box pushed on carpet gives less friction. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) oil on a squeaky hinge (d) a tyre with deep treads
35. 35.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
36. 36.🛞 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 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
37. 37.🔍 Which is the odd one out? (a) a wet tiled floor (b) a grippy rubber sole (c) a wheel on ball bearings (d) powder on a carrom board
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 3 N, a glass sheet 6 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
39. 39.🛞 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 5 N, sandpaper 7 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 12 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank

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