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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 466 · 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 8 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  2. 2.True or false: a fixed pulley stays in one place. (a) False (b) True
  3. 3.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
  4. 4.🪝 A pulley system lifts a 300 N load with an effort of 150 N. What is its mechanical advantage (MA)?
  5. 5.True or false: a movable pulley halves the effort. (a) True (b) False
  6. 6.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
  7. 7.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  8. 8.🪝 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)
  9. 9.True or false: a fixed pulley only changes direction. (a) True (b) False
  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.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  12. 12.🪝 A winch has a wheel of radius 15 cm and an axle of radius 3 cm. What effort on the wheel lifts a 350 N bucket on the axle, in newtons? (ideal)
  13. 13.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
  14. 14.🪝 A winch has a wheel of radius 5 cm and an axle of radius 1 cm. What effort on the wheel lifts a 250 N bucket on the axle, in newtons? (ideal)
  15. 15.🪝 A pulley system lifts a 260 N load with an effort of 130 N. What is its mechanical advantage (MA)?
  16. 16.🪝 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)
  17. 17.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the colour of rope (d) the direction of pull
  18. 18.🪝 A pulley system lifts a 120 N load with an effort of 40 N. What is its mechanical advantage (MA)?
  19. 19.🪝 A pulley system lifts a 560 N load with an effort of 280 N. What is its mechanical advantage (MA)?
  20. 20.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
  21. 21.🪝 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?
  22. 22.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
  23. 23.🪝 A load of 60 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  24. 24.🪝 A well winch has a handle (wheel) of radius 40 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  25. 25.True or false: a movable pulley rises with the load. (a) True (b) False
  26. 26.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
  27. 27.True or false: a fixed pulley rises with the load. (a) False (b) True
  28. 28.🪝 A pulley system lifts a 680 N load with an effort of 170 N. What is its mechanical advantage (MA)?
  29. 29.True or false: a movable pulley is on a flagpole top. (a) False (b) True
  30. 30.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
  31. 31.🪝 More rope sections holding a load means … (a) no change (b) the load floats (c) more effort needed (d) less effort needed
  32. 32.🪝 A winch has a wheel of radius 12 cm and an axle of radius 4 cm. What effort on the wheel lifts a 210 N bucket on the axle, in newtons? (ideal)
  33. 33.🪝 A load of 210 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  34. 34.True or false: a movable pulley stays in one place. (a) False (b) True
  35. 35.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
  36. 36.🪝 A pulley system lifts a 780 N load with an effort of 260 N. What is its mechanical advantage (MA)?
  37. 37.🪝 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)
  38. 38.True or false: a fixed pulley halves the effort. (a) False (b) True
  39. 39.🪝 A load of 1120 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  40. 40.True or false: a movable pulley needs effort = load. (a) False (b) True

Answer key

  1. 2
  2. True
  3. True
  4. 2
  5. True
  6. a movable pulley
  7. a fixed pulley
  8. 170
  9. True
  10. 50
  11. a fixed pulley
  12. 70
  13. a fixed pulley
  14. 50
  15. 2
  16. 270
  17. the direction of pull
  18. 3
  19. 2
  20. a movable pulley
  21. 3
  22. 12
  23. 20
  24. 8
  25. True
  26. a movable pulley
  27. False
  28. 4
  29. False
  30. True
  31. less effort needed
  32. 70
  33. 70
  34. False
  35. False
  36. 3
  37. a smaller rod (axle)
  38. False
  39. 280
  40. False

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