Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 713 · 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.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
2. 2.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
3. 3.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
4. 4.True or false: a rough doormat gives less friction. (a) True (b) False
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
6. 6.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
7. 7.🔍 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
8. 8.True or false: powder on a carrom board gives more friction. (a) False (b) True
9. 9.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
10. 10.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 2 N, a glass sheet 6 N, a wooden plank 9 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, ice 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
13. 13.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
14. 14.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) a rough doormat (d) chalk on a gym bar
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 10 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on a glass sheet?
16. 16.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 6 N, sandpaper 8 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 4 N, a glass sheet 5 N, a carpet 6 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
19. 19.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) skating on ice (d) powder on a carrom board
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, a glass sheet 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
21. 21.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
22. 22.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) chalk on a gym bar (d) a grippy rubber sole
23. 23.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
25. 25.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
26. 26.True or false: sand on a slippery path gives more friction. (a) False (b) True
27. 27.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
29. 29.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a wet tiled floor (d) a grippy rubber sole
30. 30.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
32. 32.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 3 N, a glass sheet 7 N, a wooden plank 11 N. How many newtons more were needed on a carpet than on ice?
34. 34.True or false: a wet tiled floor gives less friction. (a) False (b) True
35. 35.🛞 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 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 12 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 2 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 8 N, a carpet 10 N, ice 3 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 2 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet

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