Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 347 · 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 7 N, a wooden plank 8 N, sandpaper 11 N, ice 4 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
2. 2.🛞 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, sandpaper 7 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
3. 3.🛞 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 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
4. 4.🛞 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 9 N, sandpaper 12 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 5 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 11 N, ice 3 N, a glass sheet 6 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
7. 7.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
8. 8.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) sand on a slippery path
9. 9.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
10. 10.🔍 Which is the odd one out? (a) a smooth steel slide (b) a tyre with deep treads (c) chalk on a gym bar (d) a box pushed on carpet
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 11 N, sandpaper 14 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
12. 12.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
13. 13.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 5 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 10 N, ice 4 N, a glass sheet 6 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
16. 16.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) a tyre with deep treads (d) a rough doormat
17. 17.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
18. 18.🔍 Which is the odd one out? (a) a wet tiled floor (b) a grippy rubber sole (c) a rough doormat (d) chalk on a gym bar
19. 19.🛞 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 8 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 12 N, ice 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
21. 21.True or false: sand on a slippery path gives more friction. (a) False (b) True
22. 22.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
23. 23.True or false: a wet tiled floor gives more friction. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) skating on ice (d) a tyre with deep treads
25. 25.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
27. 27.True or false: a tyre with deep treads gives less friction. (a) False (b) True
28. 28.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
29. 29.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 4 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
33. 33.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) wet (d) cold
34. 34.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
35. 35.True or false: a box pushed on carpet gives less friction. (a) True (b) False
36. 36.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
37. 37.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) a smooth steel slide (d) oil on a squeaky hinge
38. 38.True or false: a wet tiled floor gives less friction. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet

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