Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 107 · 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.True or false: chalk on a gym bar gives less friction. (a) True (b) False
2. 2.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 3 N, a glass sheet 6 N, a wooden plank 9 N. How many newtons more were needed on a carpet than on ice?
4. 4.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
5. 5.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
6. 6.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
7. 7.True or false: a grippy rubber sole gives less friction. (a) False (b) True
8. 8.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
9. 9.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 3 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 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 carpet (b) ice (c) a wooden plank (d) sandpaper
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
13. 13.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 2 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
15. 15.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
17. 17.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a box pushed on carpet (d) powder on a carrom board
18. 18.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
19. 19.True or false: a rough doormat gives less friction. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) a wet tiled floor (d) a tyre with deep treads
21. 21.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
22. 22.True or false: powder on a carrom board gives less friction. (a) False (b) True
23. 23.🛞 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 wooden plank 8 N, sandpaper 11 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
24. 24.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
25. 25.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
26. 26.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a grippy rubber sole (d) a wet tiled floor
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, a glass sheet 3 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.🛞 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 9 N, sandpaper 12 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 4 N, a glass sheet 6 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
30. 30.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
31. 31.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a tyre with deep treads (d) a box pushed on carpet
32. 32.True or false: a wet tiled floor gives more friction. (a) True (b) False
33. 33.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
35. 35.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
36. 36.True or false: powder on a carrom board gives more friction. (a) True (b) False
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, ice 2 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 9 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
39. 39.True or false: a tyre with deep treads gives less friction. (a) True (b) False
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a wooden plank 3 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?

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