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Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 206 · 40 questions
TalentJR

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.

NameDateTime takenScore ___ / 40
  1. 1.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
  2. 2.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
  3. 3.True or false: skating on ice gives less friction. (a) False (b) True
  4. 4.True or false: chalk on a gym bar gives less friction. (a) True (b) False
  5. 5.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
  6. 6.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
  7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 7 N, sandpaper 11 N, ice 4 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
  8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
  9. 9.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
  10. 10.True or false: a rough doormat gives more friction. (a) False (b) True
  11. 11.True or false: chalk on a gym bar gives more friction. (a) False (b) True
  12. 12.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) a wet tiled floor (d) a tyre with deep treads
  13. 13.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) chalk on a gym bar (d) powder on a carrom board
  14. 14.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
  15. 15.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
  16. 16.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
  17. 17.🛞 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 most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
  18. 18.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) warm (d) wet
  19. 19.True or false: powder on a carrom board gives more friction. (a) True (b) False
  20. 20.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
  21. 21.True or false: a smooth steel slide gives more friction. (a) False (b) True
  22. 22.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
  23. 23.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) skating on ice (d) a rough doormat
  24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, ice 2 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
  25. 25.True or false: a smooth steel slide gives less friction. (a) False (b) True
  26. 26.True or false: a box pushed on carpet gives more friction. (a) True (b) False
  27. 27.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
  28. 28.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) skating on ice (d) a grippy rubber sole
  29. 29.🛞 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 1 N. How many newtons more were needed on sandpaper than on ice?
  30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, ice 3 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
  31. 31.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
  32. 32.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
  33. 33.🛞 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 carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
  34. 34.🔍 Which is the odd one out? (a) skating on ice (b) a smooth steel slide (c) a wet tiled floor (d) a box pushed on carpet
  35. 35.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
  36. 36.True or false: sand on a slippery path gives less friction. (a) True (b) False
  37. 37.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
  38. 38.True or false: a box pushed on carpet gives less friction. (a) False (b) True
  39. 39.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
  40. 40.True or false: a wet tiled floor gives more friction. (a) True (b) False

Answer key

  1. more friction
  2. less friction
  3. True
  4. False
  5. a problem
  6. less friction
  7. ice
  8. sandpaper
  9. more friction
  10. True
  11. True
  12. a wet tiled floor
  13. powder on a carrom board
  14. a problem
  15. helpful
  16. more friction
  17. a carpet
  18. warm
  19. False
  20. against the motion
  21. False
  22. less friction
  23. skating on ice
  24. a carpet
  25. True
  26. True
  27. more friction
  28. a grippy rubber sole
  29. 7
  30. 6
  31. False
  32. less friction
  33. sandpaper
  34. a box pushed on carpet
  35. more friction
  36. False
  37. a problem
  38. False
  39. a problem
  40. False

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