Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 163 · 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.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
2. 2.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) powder on a carrom board (d) skating on ice
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 5 N, sandpaper 6 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
4. 4.🛞 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 6 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
5. 5.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a grippy rubber sole (d) a wet tiled floor
6. 6.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 1 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
9. 9.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) skating on ice (d) a rough doormat
10. 10.True or false: a grippy rubber sole gives less friction. (a) False (b) True
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
12. 12.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
13. 13.True or false: a rough doormat gives less friction. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) chalk on a gym bar (d) sand on a slippery path
15. 15.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) a rough doormat (d) oil on a squeaky hinge
16. 16.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
17. 17.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
18. 18.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
19. 19.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 10 N, a carpet 13 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
21. 21.True or false: a rough doormat gives more friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a wooden plank 4 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
25. 25.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) warm (d) wet
26. 26.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 8 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
29. 29.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 3 N, sandpaper 7 N, a glass sheet 1 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
32. 32.True or false: a tyre with deep treads gives less friction. (a) False (b) True
33. 33.True or false: a grippy rubber sole gives more friction. (a) True (b) False
34. 34.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
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 11 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
36. 36.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
37. 37.True or false: a wet tiled floor gives more friction. (a) True (b) False
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 1 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, sandpaper 7 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
40. 40.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to look nice (d) to save rubber

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