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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 961 · 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 bucket weighing 250 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  2. 2.🪝 A bucket weighing 480 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  3. 3.🪝 A winch has a wheel of radius 5 cm and an axle of radius 1 cm. What effort on the wheel lifts a 500 N bucket on the axle, in newtons? (ideal)
  4. 4.True or false: a movable pulley stays in one place. (a) False (b) True
  5. 5.🪝 A pulley system lifts a 400 N load with an effort of 100 N. What is its mechanical advantage (MA)?
  6. 6.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
  7. 7.🪝 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?
  8. 8.🪝 A pulley system lifts a 440 N load with an effort of 220 N. What is its mechanical advantage (MA)?
  9. 9.🪝 More rope sections holding a load means … (a) the load floats (b) more effort needed (c) less effort needed (d) no change
  10. 10.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  11. 11.True or false: a movable pulley only changes direction. (a) False (b) True
  12. 12.🪝 A load of 600 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  13. 13.🪝 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)
  14. 14.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
  15. 15.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  16. 16.True or false: a movable pulley rises with the load. (a) False (b) True
  17. 17.🪝 What does a single fixed pulley change? (a) the size of the load (b) the direction of pull (c) the colour of rope (d) gravity
  18. 18.🪝 A well winch has a handle (wheel) of radius 24 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  19. 19.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  20. 20.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  21. 21.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 9 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 6 m, how many metres of rope must you pull?
  23. 23.🪝 A pulley system lifts a 690 N load with an effort of 230 N. What is its mechanical advantage (MA)?
  24. 24.🪝 A bucket weighing 130 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  25. 25.🪝 A bucket weighing 180 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 pulley system has 2 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
  27. 27.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
  28. 28.True or false: a movable pulley halves the effort. (a) False (b) True
  29. 29.🪝 A winch has a wheel of radius 4 cm and an axle of radius 1 cm. What effort on the wheel lifts a 160 N bucket on the axle, in newtons? (ideal)
  30. 30.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
  31. 31.🪝 A pulley system lifts a 460 N load with an effort of 230 N. What is its mechanical advantage (MA)?
  32. 32.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  33. 33.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
  34. 34.🪝 A winch has a wheel of radius 6 cm and an axle of radius 1 cm. What effort on the wheel lifts a 1020 N bucket on the axle, in newtons? (ideal)
  35. 35.🪝 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)
  36. 36.True or false: a fixed pulley only changes direction. (a) True (b) False
  37. 37.True or false: a movable pulley is on a flagpole top. (a) True (b) False
  38. 38.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  39. 39.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
  40. 40.🪝 A winch has a wheel of radius 14 cm and an axle of radius 2 cm. What effort on the wheel lifts a 1260 N bucket on the axle, in newtons? (ideal)

Answer key

  1. 250
  2. 480
  3. 100
  4. False
  5. 4
  6. a movable pulley
  7. 28
  8. 2
  9. less effort needed
  10. 3
  11. False
  12. 200
  13. 50
  14. False
  15. a fixed pulley
  16. True
  17. the direction of pull
  18. 8
  19. a fixed pulley
  20. a fixed pulley
  21. 36
  22. 18
  23. 3
  24. 130
  25. 180
  26. 16
  27. True
  28. True
  29. 40
  30. a movable pulley
  31. 2
  32. a movable pulley
  33. 8
  34. 170
  35. 430
  36. True
  37. False
  38. 5
  39. 32
  40. 180

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