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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 414 · 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 pulley system lifts a 120 N load with an effort of 60 N. What is its mechanical advantage (MA)?
  2. 2.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
  3. 3.🪝 More rope sections holding a load means … (a) no change (b) less effort needed (c) the load floats (d) more effort needed
  4. 4.🪝 A winch has a wheel of radius 6 cm and an axle of radius 3 cm. What effort on the wheel lifts a 320 N bucket on the axle, in newtons? (ideal)
  5. 5.🪝 A well winch has a handle (wheel) of radius 40 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  6. 6.True or false: a fixed pulley needs effort = load. (a) True (b) False
  7. 7.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
  8. 8.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
  9. 9.True or false: a movable pulley only changes direction. (a) False (b) True
  10. 10.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a loose rope (c) a sharp wedge (d) a flat ramp
  11. 11.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
  12. 12.True or false: a fixed pulley halves the effort. (a) False (b) True
  13. 13.🪝 A load of 560 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  14. 14.🪝 A pulley system lifts a 280 N load with an effort of 140 N. What is its mechanical advantage (MA)?
  15. 15.🪝 A bucket weighing 200 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  16. 16.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
  17. 17.🪝 A winch has a wheel of radius 15 cm and an axle of radius 3 cm. What effort on the wheel lifts a 400 N bucket on the axle, in newtons? (ideal)
  18. 18.🪝 A bucket weighing 290 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  19. 19.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  20. 20.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  21. 21.🪝 A bucket weighing 90 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  22. 22.🪝 A winch has a wheel of radius 12 cm and an axle of radius 4 cm. What effort on the wheel lifts a 300 N bucket on the axle, in newtons? (ideal)
  23. 23.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
  24. 24.🪝 A pulley system lifts a 200 N load with an effort of 50 N. What is its mechanical advantage (MA)?
  25. 25.🪝 A bucket weighing 410 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  26. 26.🪝 A winch has a wheel of radius 24 cm and an axle of radius 3 cm. What effort on the wheel lifts a 480 N bucket on the axle, in newtons? (ideal)
  27. 27.True or false: a fixed pulley stays in one place. (a) False (b) True
  28. 28.🪝 A winch has a wheel of radius 7 cm and an axle of radius 1 cm. What effort on the wheel lifts a 280 N bucket on the axle, in newtons? (ideal)
  29. 29.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
  30. 30.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
  31. 31.🪝 A pulley system lifts a 390 N load with an effort of 130 N. What is its mechanical advantage (MA)?
  32. 32.🪝 A load of 80 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  33. 33.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
  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 260 N bucket on the axle, in newtons? (ideal)
  35. 35.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  36. 36.True or false: a fixed pulley rises with the load. (a) False (b) True
  37. 37.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  38. 38.🪝 A well winch has a handle (wheel) of radius 3 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  39. 39.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
  40. 40.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?

Answer key

  1. 2
  2. a fixed pulley
  3. less effort needed
  4. 160
  5. 8
  6. True
  7. False
  8. 5
  9. False
  10. a smaller rod (axle)
  11. 20
  12. False
  13. 280
  14. 2
  15. 200
  16. a movable pulley
  17. 80
  18. 290
  19. 3
  20. 2
  21. 90
  22. 100
  23. True
  24. 4
  25. 410
  26. 60
  27. True
  28. 40
  29. a movable pulley
  30. 4
  31. 3
  32. 40
  33. False
  34. 130
  35. 2
  36. False
  37. a fixed pulley
  38. 3
  39. 2
  40. 40

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