Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 348 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
2. 2.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
3. 3.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) polished marble (d) ice
4. 4.True or false: powder on a carrom board gives more friction. (a) False (b) True
5. 5.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
6. 6.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 6 N, sandpaper 9 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
8. 8.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
9. 9.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
10. 10.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice
11. 11.True or false: chalk on a gym bar gives more friction. (a) False (b) True
12. 12.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) skating on ice (d) a box pushed on carpet
13. 13.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) skating on ice (d) a tyre with deep treads
14. 14.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
15. 15.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
16. 16.True or false: a rough doormat gives more friction. (a) False (b) True
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 3 N, a glass sheet 4 N, a carpet 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 3 N, a glass sheet 4 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?
19. 19.🛞 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, a carpet 10 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
21. 21.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
22. 22.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
23. 23.🛞 More or less friction: chalk on a gym bar? (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 2 N, a glass sheet 3 N, a carpet 5 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, ice 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
26. 26.True or false: a smooth steel slide gives less friction. (a) True (b) False
27. 27.True or false: a wet tiled floor gives more friction. (a) True (b) False
28. 28.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
29. 29.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
30. 30.True or false: a tyre with deep treads gives more friction. (a) False (b) True
31. 31.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 9 N, ice 3 N, a glass sheet 7 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 2 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a wooden plank 3 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
35. 35.True or false: powder on a carrom board gives less friction. (a) False (b) True
36. 36.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
37. 37.True or false: skating on ice gives more friction. (a) True (b) False
38. 38.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
39. 39.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) warm (d) wet
40. 40.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) a rough doormat (d) powder on a carrom board

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