Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 151 · 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 4 N, a wooden plank 6 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
2. 2.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 12 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
4. 4.🛞 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, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
5. 5.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) a wheel on ball bearings (d) a grippy rubber sole
6. 6.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
7. 7.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
9. 9.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
10. 10.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a wet tiled floor (d) a grippy rubber sole
11. 11.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
12. 12.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 6 N, sandpaper 9 N, ice 3 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 2 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
15. 15.True or false: skating on ice gives less friction. (a) False (b) True
16. 16.🛞 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, sandpaper 13 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
17. 17.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
18. 18.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
19. 19.🛞 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 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
20. 20.True or false: a rough doormat gives less friction. (a) False (b) True
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
23. 23.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
24. 24.🔍 Which is the odd one out? (a) a wet tiled floor (b) a box pushed on carpet (c) a wheel on ball bearings (d) a smooth steel slide
25. 25.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
26. 26.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wheel on ball bearings (c) skating on ice (d) a wet tiled floor
27. 27.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) skating on ice (d) a wet tiled floor
28. 28.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, ice 2 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
30. 30.True or false: chalk on a gym bar gives less friction. (a) True (b) False
31. 31.True or false: chalk on a gym bar gives more friction. (a) False (b) True
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
33. 33.🛞 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 6 N, a carpet 8 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 4 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
35. 35.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
36. 36.True or false: a wet tiled floor gives more friction. (a) False (b) True
37. 37.True or false: a grippy rubber sole gives less friction. (a) True (b) False
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 3 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
39. 39.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
40. 40.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a rough doormat

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