Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 595 · 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.True or false: a rough doormat gives more friction. (a) True (b) False
2. 2.True or false: a smooth steel slide gives more friction. (a) False (b) True
3. 3.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
4. 4.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
5. 5.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a wet tiled floor
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 13 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
7. 7.True or false: sand on a slippery path gives more friction. (a) False (b) True
8. 8.🛞 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, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
9. 9.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) a wet tiled floor (d) chalk on a gym bar
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, sandpaper 13 N, ice 4 N, a glass sheet 7 N. How many newtons more were needed on sandpaper than on ice?
11. 11.True or false: a smooth steel slide gives less friction. (a) True (b) False
12. 12.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 7 N, a carpet 11 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
14. 14.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
15. 15.True or false: a box pushed on carpet gives less friction. (a) False (b) True
16. 16.True or false: a tyre with deep treads gives less friction. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) sand on a slippery path (d) powder on a carrom board
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
19. 19.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
20. 20.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 13 N, ice 2 N, a glass sheet 6 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
22. 22.🛞 Friction acts … (a) with the motion (b) against the motion (c) only upwards (d) only on ice
23. 23.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 4 N, a carpet 8 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
25. 25.🛞 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 carpet 5 N, sandpaper 6 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
26. 26.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) chalk on a gym bar (d) skating on ice
27. 27.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
28. 28.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) cold (d) magnetic
29. 29.True or false: a wet tiled floor gives less friction. (a) True (b) False
30. 30.True or false: a box pushed on carpet gives more friction. (a) False (b) True
31. 31.True or false: a tyre with deep treads gives more friction. (a) False (b) True
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 6 N, a wooden plank 10 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
34. 34.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a smooth steel slide (d) chalk on a gym bar
35. 35.🛞 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 carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
36. 36.True or false: a rough doormat gives less friction. (a) True (b) False
37. 37.🛞 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 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
39. 39.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
40. 40.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful

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