Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 324 · 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: ice 1 N, a glass sheet 3 N, a wooden plank 6 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
2. 2.True or false: a rough doormat gives less friction. (a) False (b) True
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, sandpaper 12 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
4. 4.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
5. 5.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
6. 6.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
7. 7.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
9. 9.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a smooth steel slide (d) chalk on a gym bar
10. 10.True or false: skating on ice gives more friction. (a) False (b) True
11. 11.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
13. 13.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
14. 14.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
15. 15.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) oil on a squeaky hinge (d) sand on a slippery path
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
19. 19.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
20. 20.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
21. 21.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
22. 22.🛞 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 8 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
23. 23.True or false: a wet tiled floor gives more friction. (a) False (b) True
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 14 N, ice 3 N, a glass sheet 7 N, a wooden plank 11 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
25. 25.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 9 N, sandpaper 13 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
27. 27.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) a wheel on ball bearings (d) skating on ice
28. 28.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
30. 30.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a grippy rubber sole (d) a smooth steel slide
31. 31.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
32. 32.True or false: a smooth steel slide gives less friction. (a) True (b) False
33. 33.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
34. 34.🔍 Which is the odd one out? (a) a wet tiled floor (b) a grippy rubber sole (c) a wheel on ball bearings (d) powder on a carrom board
35. 35.True or false: chalk on a gym bar gives more friction. (a) False (b) True
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 2 N, a carpet 4 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, sandpaper 13 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
40. 40.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem

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