Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 182 · 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 glass sheet 3 N, a carpet 7 N, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a wet tiled floor (d) a rough doormat
3. 3.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 8 N, a carpet 10 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
6. 6.True or false: powder on a carrom board gives less friction. (a) True (b) False
7. 7.True or false: skating on ice gives more friction. (a) True (b) False
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 13 N, ice 3 N, a glass sheet 6 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
9. 9.True or false: sand on a slippery path gives more friction. (a) False (b) True
10. 10.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
11. 11.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
12. 12.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a grippy rubber sole (d) skating on ice
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
14. 14.True or false: a grippy rubber sole gives less friction. (a) True (b) False
15. 15.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
16. 16.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
19. 19.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 11 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 7 N, sandpaper 10 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 1 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
25. 25.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
26. 26.🛞 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 4 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
27. 27.True or false: a rough doormat gives less friction. (a) False (b) True
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 least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
29. 29.🛞 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 carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
30. 30.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) oil on a squeaky hinge (d) a tyre with deep treads
31. 31.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
32. 32.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) a wheel on ball bearings (d) a box pushed on carpet
33. 33.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
34. 34.🛞 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 5 N, sandpaper 7 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
35. 35.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a smooth steel slide (c) a tyre with deep treads (d) chalk on a gym bar
37. 37.True or false: chalk on a gym bar gives more friction. (a) False (b) True
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
39. 39.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
40. 40.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) wet (d) warm

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