Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 983 · 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.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
2. 2.True or false: sand on a slippery path gives less friction. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) oil on a squeaky hinge (d) a smooth steel slide
4. 4.🛞 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. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
5. 5.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
6. 6.True or false: a box pushed on carpet gives less friction. (a) True (b) False
7. 7.True or false: chalk on a gym bar gives less friction. (a) False (b) True
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
9. 9.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
10. 10.True or false: sand on a slippery path gives more friction. (a) True (b) False
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 4 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
12. 12.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
13. 13.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 4 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 4 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
16. 16.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to save rubber (d) to go slower
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 8 N, a glass sheet 3 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
18. 18.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
19. 19.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
20. 20.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) wet (d) warm
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 12 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
22. 22.🛞 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 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
23. 23.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a wet tiled floor (d) a box pushed on carpet
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 9 N, sandpaper 11 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 5 N, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 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. How many newtons more were needed on a carpet than on ice?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 8 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
30. 30.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
31. 31.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
32. 32.🛞 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, ice 4 N, a glass sheet 5 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
33. 33.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
34. 34.🛞 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 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
35. 35.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) skating on ice (d) chalk on a gym bar
36. 36.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
37. 37.True or false: a wet tiled floor gives less friction. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) chalk on a gym bar (d) oil on a squeaky hinge
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
40. 40.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) sand on a slippery path (d) a grippy rubber sole

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