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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 420 · 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.True or false: a movable pulley rises with the load. (a) True (b) False
  2. 2.🪝 What does a single fixed pulley change? (a) gravity (b) the colour of rope (c) the size of the load (d) the direction of pull
  3. 3.🪝 A pulley system lifts a 120 N load with an effort of 30 N. What is its mechanical advantage (MA)?
  4. 4.🪝 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)
  5. 5.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
  6. 6.🪝 A load of 1160 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  7. 7.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
  8. 8.True or false: a movable pulley stays in one place. (a) True (b) False
  9. 9.🪝 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)
  10. 10.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
  11. 11.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  12. 12.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
  13. 13.🪝 A well winch has a handle (wheel) of radius 30 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  14. 14.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  15. 15.🪝 A load of 400 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  16. 16.🪝 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)
  17. 17.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
  18. 18.🪝 A winch has a wheel of radius 20 cm and an axle of radius 5 cm. What effort on the wheel lifts a 400 N bucket on the axle, in newtons? (ideal)
  19. 19.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 60 N bucket on the axle, in newtons? (ideal)
  20. 20.🪝 A pulley system lifts a 60 N load with an effort of 20 N. What is its mechanical advantage (MA)?
  21. 21.🪝 A load of 40 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  22. 22.🪝 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)
  23. 23.True or false: a movable pulley is on a flagpole top. (a) True (b) False
  24. 24.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  25. 25.True or false: a movable pulley needs effort = load. (a) True (b) False
  26. 26.🪝 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?
  27. 27.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
  28. 28.🪝 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?
  29. 29.🪝 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)
  30. 30.🪝 A well winch has a handle (wheel) of radius 7 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  31. 31.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  32. 32.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
  33. 33.🪝 A pulley system lifts a 450 N load with an effort of 150 N. What is its mechanical advantage (MA)?
  34. 34.🪝 A pulley system lifts a 180 N load with an effort of 90 N. What is its mechanical advantage (MA)?
  35. 35.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
  36. 36.🪝 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)
  37. 37.🪝 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)
  38. 38.True or false: a fixed pulley stays in one place. (a) True (b) False
  39. 39.🪝 A load of 80 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.🪝 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)

Answer key

  1. True
  2. the direction of pull
  3. 4
  4. a smaller rod (axle)
  5. a movable pulley
  6. 290
  7. True
  8. False
  9. 130
  10. 21
  11. 2
  12. False
  13. 6
  14. 2
  15. 200
  16. 150
  17. a fixed pulley
  18. 100
  19. 30
  20. 3
  21. 20
  22. 430
  23. False
  24. a fixed pulley
  25. False
  26. 5
  27. 12
  28. 3
  29. 50
  30. 7
  31. a fixed pulley
  32. 18
  33. 3
  34. 2
  35. a movable pulley
  36. 40
  37. 160
  38. True
  39. 20
  40. 180

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