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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 617 · 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 720 N load with an effort of 180 N. What is its mechanical advantage (MA)?
  2. 2.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
  3. 3.🪝 A bucket weighing 240 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.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  5. 5.True or false: a fixed pulley halves the effort. (a) False (b) True
  6. 6.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) the direction of pull (d) gravity
  7. 7.🪝 A winch has a wheel of radius 12 cm and an axle of radius 3 cm. What effort on the wheel lifts a 120 N bucket on the axle, in newtons? (ideal)
  8. 8.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  9. 9.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
  10. 10.🪝 More rope sections holding a load means … (a) the load floats (b) no change (c) less effort needed (d) more effort needed
  11. 11.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 360 N bucket on the axle, in newtons? (ideal)
  12. 12.True or false: a movable pulley rises with the load. (a) True (b) False
  13. 13.True or false: a movable pulley stays in one place. (a) True (b) False
  14. 14.🪝 A pulley system lifts a 520 N load with an effort of 260 N. What is its mechanical advantage (MA)?
  15. 15.🪝 A winch has a wheel of radius 3 cm and an axle of radius 1 cm. What effort on the wheel lifts a 300 N bucket on the axle, in newtons? (ideal)
  16. 16.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  17. 17.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
  18. 18.🪝 A winch has a wheel of radius 6 cm and an axle of radius 2 cm. What effort on the wheel lifts a 360 N bucket on the axle, in newtons? (ideal)
  19. 19.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
  20. 20.🪝 A bucket weighing 310 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  21. 21.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  22. 22.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  23. 23.🪝 A well winch has a handle (wheel) of radius 35 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  24. 24.🪝 A load of 600 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  25. 25.🪝 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)
  26. 26.🪝 A pulley system lifts a 340 N load with an effort of 170 N. What is its mechanical advantage (MA)?
  27. 27.🪝 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)
  28. 28.🪝 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)
  29. 29.True or false: a movable pulley only changes direction. (a) True (b) False
  30. 30.🪝 A winch has a wheel of radius 6 cm and an axle of radius 2 cm. What effort on the wheel lifts a 270 N bucket on the axle, in newtons? (ideal)
  31. 31.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  32. 32.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  33. 33.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
  34. 34.🪝 A pulley system lifts a 750 N load with an effort of 250 N. What is its mechanical advantage (MA)?
  35. 35.🪝 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?
  36. 36.🪝 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)
  37. 37.🪝 A well winch has a handle (wheel) of radius 30 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  38. 38.True or false: a movable pulley is on a flagpole top. (a) False (b) True
  39. 39.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
  40. 40.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 220 N bucket on the axle, in newtons? (ideal)

Answer key

  1. 4
  2. 20
  3. 240
  4. 2
  5. False
  6. the direction of pull
  7. 30
  8. a movable pulley
  9. a movable pulley
  10. less effort needed
  11. 180
  12. True
  13. False
  14. 2
  15. 100
  16. 2
  17. a movable pulley
  18. 120
  19. a fixed pulley
  20. 310
  21. 4
  22. a fixed pulley
  23. 7
  24. 300
  25. 210
  26. 2
  27. 50
  28. 280
  29. False
  30. 90
  31. 5
  32. a fixed pulley
  33. a movable pulley
  34. 3
  35. 8
  36. 150
  37. 6
  38. False
  39. False
  40. 110

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