Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 937 · 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.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wheel on ball bearings (c) skating on ice (d) oil on a squeaky hinge
2. 2.True or false: a box pushed on carpet gives less friction. (a) False (b) True
3. 3.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a carpet 8 N, sandpaper 10 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) ice (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 8 N, a carpet 12 N, ice 4 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
7. 7.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
8. 8.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 9 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: a wooden plank 7 N, a carpet 11 N, sandpaper 14 N, a glass sheet 4 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
11. 11.🛞 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 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 1 N, a wooden plank 3 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
14. 14.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) chalk on a gym bar (d) a rough doormat
15. 15.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a box pushed on carpet (d) skating on ice
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 9 N, a carpet 12 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
17. 17.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a wet tiled floor (d) a wheel on ball bearings
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
21. 21.🛞 Is friction helpful or a problem here: striking a matchstick? (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 6 N, a carpet 7 N, sandpaper 9 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
23. 23.True or false: a rough doormat gives more friction. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) skating on ice (d) a rough doormat
25. 25.True or false: a tyre with deep treads gives less friction. (a) True (b) False
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, a carpet 12 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
28. 28.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) chalk on a gym bar (d) a rough doormat
29. 29.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
30. 30.True or false: a rough doormat gives less friction. (a) True (b) False
31. 31.True or false: skating on ice gives more friction. (a) True (b) False
32. 32.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
33. 33.True or false: powder on a carrom board gives less friction. (a) True (b) False
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
35. 35.True or false: a grippy rubber sole gives less friction. (a) False (b) True
36. 36.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
37. 37.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 4 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?

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