Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 662 · 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.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to save rubber (d) to go slower
2. 2.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
3. 3.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
4. 4.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) powder on a carrom board (d) a rough doormat
5. 5.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
6. 6.True or false: a rough doormat gives more friction. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a box pushed on carpet (d) a smooth steel slide
8. 8.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, a glass sheet 3 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
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 3 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
12. 12.True or false: a box pushed on carpet gives less friction. (a) True (b) False
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 7 N, a wooden plank 9 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
14. 14.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
15. 15.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
16. 16.True or false: a rough doormat gives less friction. (a) False (b) True
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 6 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
18. 18.True or false: a smooth steel slide gives less friction. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) chalk on a gym bar (d) a grippy rubber sole
20. 20.True or false: a tyre with deep treads gives more friction. (a) True (b) False
21. 21.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
22. 22.🛞 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 14 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
23. 23.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
24. 24.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 10 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 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 most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
27. 27.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
28. 28.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 9 N, sandpaper 13 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
30. 30.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 7 N, sandpaper 9 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
34. 34.🛞 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, sandpaper 10 N, a glass sheet 4 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
35. 35.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 8 N, sandpaper 9 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
37. 37.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
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 8 N, sandpaper 9 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
40. 40.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a tyre with deep treads (d) a smooth steel slide

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