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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 300 · 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.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  2. 2.True or false: a movable pulley halves the effort. (a) True (b) False
  3. 3.🪝 A pulley system lifts a 480 N load with an effort of 160 N. What is its mechanical advantage (MA)?
  4. 4.🪝 A winch has a wheel of radius 25 cm and an axle of radius 5 cm. What effort on the wheel lifts a 150 N bucket on the axle, in newtons? (ideal)
  5. 5.🪝 More rope sections holding a load means … (a) no change (b) more effort needed (c) the load floats (d) less effort needed
  6. 6.True or false: a fixed pulley only changes direction. (a) False (b) True
  7. 7.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  8. 8.True or false: a movable pulley stays in one place. (a) True (b) False
  9. 9.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  10. 10.🪝 A bucket weighing 50 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  11. 11.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
  12. 12.True or false: a movable pulley only changes direction. (a) True (b) False
  13. 13.🪝 A load of 200 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  14. 14.🪝 A pulley system lifts a 270 N load with an effort of 90 N. What is its mechanical advantage (MA)?
  15. 15.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  16. 16.True or false: a fixed pulley stays in one place. (a) False (b) True
  17. 17.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a loose rope (c) a sharp wedge (d) a smaller rod (axle)
  18. 18.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
  19. 19.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
  20. 20.True or false: a fixed pulley needs effort = load. (a) True (b) False
  21. 21.🪝 A pulley system lifts a 720 N load with an effort of 240 N. What is its mechanical advantage (MA)?
  22. 22.True or false: a movable pulley rises with the load. (a) True (b) False
  23. 23.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
  24. 24.🪝 A winch has a wheel of radius 15 cm and an axle of radius 3 cm. What effort on the wheel lifts a 900 N bucket on the axle, in newtons? (ideal)
  25. 25.🪝 A load of 150 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  26. 26.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
  27. 27.🪝 A load of 420 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  28. 28.🪝 A bucket weighing 450 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  29. 29.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
  30. 30.🪝 A winch has a wheel of radius 8 cm and an axle of radius 2 cm. What effort on the wheel lifts a 560 N bucket on the axle, in newtons? (ideal)
  31. 31.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
  32. 32.🪝 A pulley system lifts a 300 N load with an effort of 100 N. What is its mechanical advantage (MA)?
  33. 33.🪝 A bucket weighing 140 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  34. 34.🪝 A pulley system lifts a 220 N load with an effort of 110 N. What is its mechanical advantage (MA)?
  35. 35.🪝 A winch has a wheel of radius 6 cm and an axle of radius 2 cm. What effort on the wheel lifts a 480 N bucket on the axle, in newtons? (ideal)
  36. 36.🪝 A winch has a wheel of radius 32 cm and an axle of radius 4 cm. What effort on the wheel lifts a 240 N bucket on the axle, in newtons? (ideal)
  37. 37.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
  38. 38.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
  39. 39.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 60 N bucket on the axle, in newtons? (ideal)
  40. 40.🪝 A bucket weighing 40 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)

Answer key

  1. 5
  2. True
  3. 3
  4. 30
  5. less effort needed
  6. True
  7. 4
  8. False
  9. a movable pulley
  10. 50
  11. 15
  12. False
  13. 50
  14. 3
  15. 3
  16. True
  17. a smaller rod (axle)
  18. False
  19. 28
  20. True
  21. 3
  22. True
  23. 3
  24. 180
  25. 50
  26. 21
  27. 210
  28. 450
  29. 3
  30. 140
  31. a movable pulley
  32. 3
  33. 140
  34. 2
  35. 160
  36. 30
  37. a fixed pulley
  38. a movable pulley
  39. 30
  40. 40

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