Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 844 · 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 surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
2. 2.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) skating on ice (d) powder on a carrom board
3. 3.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
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 7 N, sandpaper 9 N, ice 1 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
5. 5.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
6. 6.True or false: skating on ice gives more friction. (a) True (b) False
7. 7.True or false: sand on a slippery path gives more friction. (a) True (b) False
8. 8.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
9. 9.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) a smooth steel slide (d) a tyre with deep treads
10. 10.🔍 Which is the odd one out? (a) powder on a carrom board (b) a tyre with deep treads (c) a grippy rubber sole (d) a rough doormat
11. 11.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
12. 12.True or false: sand on a slippery path gives less friction. (a) False (b) True
13. 13.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
14. 14.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a tyre with deep treads (d) a wet tiled floor
15. 15.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 10 N, a carpet 12 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
17. 17.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 8 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a smooth steel slide (c) sand on a slippery path (d) a box pushed on carpet
21. 21.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) oil on a squeaky hinge (d) a wheel on ball bearings
22. 22.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
23. 23.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
24. 24.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
25. 25.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, sandpaper 10 N, ice 2 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
28. 28.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) oil on a squeaky hinge (d) a grippy rubber sole
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N, sandpaper 11 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
31. 31.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
32. 32.True or false: a wet tiled floor gives more friction. (a) False (b) True
33. 33.True or false: a box pushed on carpet gives more friction. (a) False (b) True
34. 34.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 12 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
36. 36.🛞 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, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
37. 37.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
39. 39.True or false: chalk on a gym bar gives less friction. (a) False (b) True
40. 40.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction

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