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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 702 · 40 questions
TalentJR

Engineer's tip (Count the ropes): Fixed pulley: changes direction, effort = load. Pulley system: effort = load ÷ supporting rope sections; rope pulled = lift height × that number. Wheel and axle: MA = wheel radius ÷ axle radius; effort = load ÷ MA.

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  1. 1.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  2. 2.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  3. 3.🪝 A bucket weighing 30 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  4. 4.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
  5. 5.True or false: a movable pulley stays in one place. (a) False (b) True
  6. 6.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
  7. 7.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
  8. 8.🪝 A pulley system lifts a 140 N load with an effort of 70 N. What is its mechanical advantage (MA)?
  9. 9.🪝 A pulley system lifts a 480 N load with an effort of 160 N. What is its mechanical advantage (MA)?
  10. 10.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  11. 11.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a loose rope (c) a flat ramp (d) a smaller rod (axle)
  12. 12.True or false: a movable pulley only changes direction. (a) False (b) True
  13. 13.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
  14. 14.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
  15. 15.🪝 More rope sections holding a load means … (a) less effort needed (b) the load floats (c) no change (d) more effort needed
  16. 16.🪝 A load of 360 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  17. 17.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
  18. 18.🪝 A pulley system lifts a 1160 N load with an effort of 290 N. What is its mechanical advantage (MA)?
  19. 19.🪝 A pulley system lifts a 120 N load with an effort of 60 N. What is its mechanical advantage (MA)?
  20. 20.🪝 A winch has a wheel of radius 6 cm and an axle of radius 2 cm. What effort on the wheel lifts a 330 N bucket on the axle, in newtons? (ideal)
  21. 21.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
  22. 22.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
  23. 23.True or false: a fixed pulley rises with the load. (a) False (b) True
  24. 24.🪝 A load of 1000 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  25. 25.🪝 A load of 600 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  26. 26.🪝 A load of 540 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  27. 27.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the size of the load (c) the colour of rope (d) gravity
  28. 28.True or false: a movable pulley needs effort = load. (a) True (b) False
  29. 29.🪝 A load of 80 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  30. 30.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
  31. 31.🪝 A load of 340 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  32. 32.🪝 A winch has a wheel of radius 16 cm and an axle of radius 2 cm. What effort on the wheel lifts a 720 N bucket on the axle, in newtons? (ideal)
  33. 33.🪝 A winch has a wheel of radius 24 cm and an axle of radius 3 cm. What effort on the wheel lifts a 160 N bucket on the axle, in newtons? (ideal)
  34. 34.🪝 A winch has a wheel of radius 6 cm and an axle of radius 3 cm. What effort on the wheel lifts a 340 N bucket on the axle, in newtons? (ideal)
  35. 35.🪝 A load of 660 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  36. 36.🪝 A winch has a wheel of radius 5 cm and an axle of radius 1 cm. What effort on the wheel lifts a 550 N bucket on the axle, in newtons? (ideal)
  37. 37.🪝 A winch has a wheel of radius 20 cm and an axle of radius 4 cm. What effort on the wheel lifts a 700 N bucket on the axle, in newtons? (ideal)
  38. 38.🪝 A pulley system lifts a 1000 N load with an effort of 250 N. What is its mechanical advantage (MA)?
  39. 39.🪝 A well winch has a handle (wheel) of radius 9 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  40. 40.🪝 A pulley system lifts a 280 N load with an effort of 140 N. What is its mechanical advantage (MA)?

Answer key

  1. a movable pulley
  2. a fixed pulley
  3. 30
  4. False
  5. False
  6. a fixed pulley
  7. a movable pulley
  8. 2
  9. 3
  10. a fixed pulley
  11. a smaller rod (axle)
  12. False
  13. True
  14. False
  15. less effort needed
  16. 120
  17. a fixed pulley
  18. 4
  19. 2
  20. 110
  21. 14
  22. 8
  23. False
  24. 250
  25. 150
  26. 270
  27. the direction of pull
  28. False
  29. 20
  30. a movable pulley
  31. 170
  32. 90
  33. 20
  34. 170
  35. 220
  36. 110
  37. 140
  38. 4
  39. 3
  40. 2

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