Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 649 · 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 is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) a wheel on ball bearings (d) a smooth steel slide
2. 2.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) magnetic (d) warm
3. 3.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 7 N, a carpet 10 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
7. 7.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
8. 8.True or false: a tyre with deep treads gives more friction. (a) True (b) False
9. 9.🛞 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 wooden plank 5 N, sandpaper 8 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
10. 10.True or false: powder on a carrom board gives more friction. (a) True (b) False
11. 11.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
12. 12.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
13. 13.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
14. 14.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
15. 15.True or false: a grippy rubber sole gives more friction. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) chalk on a gym bar (d) a wheel on ball bearings
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) oil on a squeaky hinge (d) a box pushed on carpet
19. 19.True or false: a rough doormat gives more friction. (a) True (b) False
20. 20.True or false: a grippy rubber sole gives less friction. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) a tyre with deep treads (d) sand on a slippery path
22. 22.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
23. 23.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
24. 24.🛞 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 7 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
25. 25.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
26. 26.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) a box pushed on carpet (d) a tyre with deep treads
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, sandpaper 13 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 9 N, sandpaper 12 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
30. 30.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) oil on a squeaky hinge (d) a smooth steel slide
32. 32.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
33. 33.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) a grippy rubber sole (d) a tyre with deep treads
34. 34.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
36. 36.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 9 N, sandpaper 10 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
38. 38.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, sandpaper 13 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?

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