Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 903 · 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: skating on ice gives more friction. (a) True (b) False
2. 2.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 13 N, ice 4 N, a glass sheet 8 N, a wooden plank 11 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
4. 4.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, ice 1 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
7. 7.True or false: a grippy rubber sole gives less friction. (a) False (b) True
8. 8.True or false: a wheel on ball bearings 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: sandpaper 11 N, ice 4 N, a glass sheet 5 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) oil on a squeaky hinge (d) sand on a slippery path
11. 11.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
12. 12.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
13. 13.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) a grippy rubber sole (d) a box pushed on carpet
14. 14.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
15. 15.True or false: a wet tiled floor gives more friction. (a) False (b) True
16. 16.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
17. 17.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
18. 18.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a rough doormat
19. 19.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
20. 20.🛞 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 carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, ice 1 N, a glass sheet 2 N, a wooden plank 3 N. How many newtons more were needed on a carpet than on ice?
23. 23.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
24. 24.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
25. 25.🛞 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, sandpaper 7 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 8 N, a glass sheet 2 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
27. 27.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
28. 28.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
29. 29.🛞 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 9 N, sandpaper 12 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
30. 30.True or false: a tyre with deep treads gives less friction. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) powder on a carrom board (d) a grippy rubber sole
32. 32.True or false: powder on a carrom board 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 13 N, ice 4 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.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 12 N, a glass sheet 1 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 6 N, sandpaper 8 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, sandpaper 5 N, ice 2 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
38. 38.True or false: chalk on a gym bar gives less friction. (a) True (b) False
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, ice 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
40. 40.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) skating on ice (d) oil on a squeaky hinge

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