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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 97 · 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 600 N load with an effort of 150 N. What is its mechanical advantage (MA)?
  2. 2.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  3. 3.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  4. 4.🪝 A bucket weighing 260 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  5. 5.True or false: a movable pulley rises with the load. (a) True (b) False
  6. 6.🪝 A bucket weighing 150 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  7. 7.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) gravity (d) the direction of pull
  8. 8.🪝 More rope sections holding a load means … (a) no change (b) the load floats (c) more effort needed (d) less effort needed
  9. 9.True or false: a fixed pulley only changes direction. (a) False (b) True
  10. 10.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
  11. 11.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
  12. 12.🪝 A winch has a wheel of radius 3 cm and an axle of radius 1 cm. What effort on the wheel lifts a 570 N bucket on the axle, in newtons? (ideal)
  13. 13.🪝 A bucket weighing 60 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  14. 14.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
  15. 15.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  16. 16.🪝 A load of 680 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  17. 17.🪝 A pulley system lifts a 120 N load with an effort of 60 N. What is its mechanical advantage (MA)?
  18. 18.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  19. 19.🪝 A winch has a wheel of radius 24 cm and an axle of radius 3 cm. What effort on the wheel lifts a 1360 N bucket on the axle, in newtons? (ideal)
  20. 20.🪝 A load of 870 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  21. 21.🪝 A winch has a wheel of radius 24 cm and an axle of radius 4 cm. What effort on the wheel lifts a 420 N bucket on the axle, in newtons? (ideal)
  22. 22.True or false: a movable pulley needs effort = load. (a) False (b) True
  23. 23.🪝 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)
  24. 24.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  25. 25.🪝 A pulley system lifts a 180 N load with an effort of 90 N. What is its mechanical advantage (MA)?
  26. 26.🪝 A load of 780 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  27. 27.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
  28. 28.🪝 A load of 240 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  29. 29.True or false: a movable pulley is on a flagpole top. (a) True (b) False
  30. 30.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  31. 31.🪝 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?
  32. 32.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a flat ramp (c) a sharp wedge (d) a smaller rod (axle)
  33. 33.🪝 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)
  34. 34.🪝 A bucket weighing 430 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  35. 35.🪝 A well winch has a handle (wheel) of radius 24 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.True or false: a movable pulley stays in one place. (a) False (b) True
  38. 38.🪝 A load of 840 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  39. 39.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
  40. 40.🪝 A load of 320 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

Answer key

  1. 4
  2. a fixed pulley
  3. a movable pulley
  4. 260
  5. True
  6. 150
  7. the direction of pull
  8. less effort needed
  9. True
  10. True
  11. True
  12. 190
  13. 60
  14. a fixed pulley
  15. a fixed pulley
  16. 170
  17. 2
  18. a fixed pulley
  19. 170
  20. 290
  21. 70
  22. False
  23. 50
  24. a movable pulley
  25. 2
  26. 260
  27. False
  28. 80
  29. False
  30. 6
  31. 40
  32. a smaller rod (axle)
  33. 210
  34. 430
  35. 8
  36. False
  37. False
  38. 210
  39. True
  40. 80

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