Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 468 · 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) oil on a squeaky hinge (b) chalk on a gym bar (c) a wet tiled floor (d) a wheel on ball bearings
2. 2.🛞 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 wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
3. 3.🔍 Which is the odd one out? (a) skating on ice (b) sand on a slippery path (c) a wet tiled floor (d) a smooth steel slide
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 12 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
5. 5.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
6. 6.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand
7. 7.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
8. 8.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) a box pushed on carpet (d) chalk on a gym bar
9. 9.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
10. 10.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
11. 11.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) a rough doormat (d) chalk on a gym bar
12. 12.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
13. 13.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 7 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
15. 15.True or false: a tyre with deep treads gives more friction. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a smooth steel slide
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 7 N, a glass sheet 2 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
18. 18.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
20. 20.True or false: a grippy rubber sole gives less friction. (a) False (b) True
21. 21.True or false: a box pushed on carpet gives less friction. (a) False (b) True
22. 22.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
23. 23.🛞 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 carpet 12 N, sandpaper 15 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 Is friction helpful or a problem here: writing with a pencil? (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 6 N, a wooden plank 8 N, sandpaper 10 N, ice 2 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
26. 26.True or false: chalk on a gym bar gives less friction. (a) False (b) True
27. 27.True or false: powder on a carrom board 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 wooden plank 5 N, a carpet 8 N, ice 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
29. 29.True or false: a wet tiled floor gives less friction. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) oil on a squeaky hinge (d) a box pushed on carpet
31. 31.True or false: sand on a slippery path gives more friction. (a) True (b) False
32. 32.True or false: a rough doormat gives more friction. (a) False (b) True
33. 33.True or false: a rough doormat gives less friction. (a) False (b) True
34. 34.🛞 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 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
35. 35.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) powder on a carrom board (d) a rough doormat
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 6 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
37. 37.True or false: a box pushed on carpet gives more friction. (a) True (b) False
38. 38.True or false: a tyre with deep treads gives less friction. (a) True (b) False
39. 39.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
40. 40.True or false: chalk on a gym bar gives more friction. (a) True (b) False

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