Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 763 · 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: ice 4 N, a glass sheet 6 N, a wooden plank 9 N, a carpet 13 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
2. 2.🛞 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. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
3. 3.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
4. 4.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
6. 6.True or false: a smooth steel slide gives less friction. (a) True (b) False
7. 7.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) polished marble (d) glass
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 10 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
10. 10.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) sand on a slippery path (c) a tyre with deep treads (d) a rough doormat
11. 11.True or false: sand on a slippery path gives less friction. (a) False (b) True
12. 12.True or false: chalk on a gym bar gives more friction. (a) False (b) True
13. 13.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
14. 14.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
15. 15.True or false: a tyre with deep treads gives less friction. (a) False (b) True
16. 16.🛞 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 2 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
18. 18.🛞 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 1 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
19. 19.True or false: a tyre with deep treads gives more friction. (a) False (b) True
20. 20.True or false: skating on ice gives more friction. (a) True (b) False
21. 21.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) magnetic (d) warm
22. 22.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
23. 23.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wet tiled floor (c) powder on a carrom board (d) a wheel on ball bearings
24. 24.True or false: a grippy rubber sole gives less friction. (a) True (b) False
25. 25.True or false: a wet tiled floor gives more friction. (a) False (b) True
26. 26.🛞 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 carpet 9 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
27. 27.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 9 N, a glass sheet 1 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
29. 29.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a box pushed on carpet (c) chalk on a gym bar (d) a rough doormat
30. 30.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
31. 31.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 3 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
33. 33.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
34. 34.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
35. 35.True or false: a smooth steel slide gives more friction. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) powder on a carrom board (d) a wheel on ball bearings
37. 37.True or false: a box pushed on carpet 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 wooden plank 4 N, a carpet 5 N, sandpaper 6 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
39. 39.True or false: a rough doormat gives more friction. (a) True (b) False
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 10 N, a carpet 14 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice

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