Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 221 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 3 N, sandpaper 5 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
2. 2.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) a rough doormat (d) a wet tiled floor
3. 3.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) oil on a squeaky hinge (d) chalk on a gym bar
5. 5.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 10 N, sandpaper 14 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
8. 8.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) a rough doormat (d) chalk on a gym bar
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 6 N, a wooden plank 9 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🛞 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 12 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
11. 11.🛞 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 10 N, sandpaper 13 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
12. 12.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) chalk on a gym bar (d) powder on a carrom board
13. 13.🔍 Which is the odd one out? (a) skating on ice (b) a smooth steel slide (c) a wet tiled floor (d) sand on a slippery path
14. 14.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
15. 15.🛞 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, a carpet 5 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 9 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
19. 19.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 13 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
21. 21.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a smooth steel slide
22. 22.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
23. 23.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
24. 24.True or false: skating on ice gives more friction. (a) True (b) False
25. 25.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, a glass sheet 1 N, a wooden plank 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
27. 27.True or false: powder on a carrom board gives more friction. (a) False (b) True
28. 28.True or false: a box pushed on carpet gives more friction. (a) False (b) True
29. 29.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
31. 31.True or false: skating on ice gives less friction. (a) True (b) False
32. 32.🛞 More or less friction: skating on ice? (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: ice 2 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 11 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
35. 35.True or false: sand on a slippery path gives less friction. (a) True (b) False
36. 36.🛞 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 5 N, a wooden plank 9 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 9 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 6 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 2 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on ice?

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