Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 471 · 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 rough doormat (c) a wheel on ball bearings (d) a grippy rubber sole
2. 2.True or false: a grippy rubber sole gives less friction. (a) False (b) True
3. 3.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
4. 4.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) powder on a carrom board (d) chalk on a gym bar
5. 5.True or false: a rough doormat gives less friction. (a) True (b) False
6. 6.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
7. 7.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 10 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
9. 9.True or false: powder on a carrom board gives more friction. (a) True (b) False
10. 10.🛞 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 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a wooden plank 8 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
15. 15.🛞 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 9 N, a glass sheet 2 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
16. 16.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
17. 17.🛞 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 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 12 N, ice 4 N, a glass sheet 6 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
19. 19.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a smooth steel slide (d) a grippy rubber sole
20. 20.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
21. 21.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) a rough doormat (d) oil on a squeaky hinge
22. 22.True or false: a tyre with deep treads gives less friction. (a) False (b) True
23. 23.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
24. 24.🛞 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, ice 2 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, a carpet 12 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
26. 26.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) a tyre with deep treads (d) a box pushed on carpet
27. 27.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 10 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
29. 29.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
30. 30.🛞 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 8 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
31. 31.True or false: a grippy rubber sole gives more friction. (a) False (b) True
32. 32.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
33. 33.True or false: a tyre with deep treads gives more friction. (a) True (b) False
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 12 N, a carpet 13 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
35. 35.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
36. 36.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
40. 40.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction

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