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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 512 · 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 well winch has a handle (wheel) of radius 7 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  2. 2.🪝 A pulley system lifts a 560 N load with an effort of 280 N. What is its mechanical advantage (MA)?
  3. 3.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  4. 4.🪝 A load of 160 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  5. 5.🪝 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?
  6. 6.True or false: a movable pulley rises with the load. (a) False (b) True
  7. 7.🪝 A pulley system lifts a 520 N load with an effort of 130 N. What is its mechanical advantage (MA)?
  8. 8.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 160 N bucket on the axle, in newtons? (ideal)
  9. 9.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  10. 10.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
  11. 11.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  12. 12.🪝 What does a single fixed pulley change? (a) gravity (b) the direction of pull (c) the size of the load (d) the colour of rope
  13. 13.True or false: a fixed pulley only changes direction. (a) True (b) False
  14. 14.🪝 A load of 120 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  15. 15.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  16. 16.True or false: a fixed pulley stays in one place. (a) True (b) False
  17. 17.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a sharp wedge (c) a smaller rod (axle) (d) a loose rope
  18. 18.🪝 A pulley system lifts a 280 N load with an effort of 70 N. What is its mechanical advantage (MA)?
  19. 19.🪝 A winch has a wheel of radius 6 cm and an axle of radius 1 cm. What effort on the wheel lifts a 1200 N bucket on the axle, in newtons? (ideal)
  20. 20.🪝 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?
  21. 21.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
  22. 22.🪝 A bucket weighing 270 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.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
  24. 24.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
  25. 25.🪝 A well winch has a handle (wheel) of radius 18 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  26. 26.True or false: a movable pulley is on a flagpole top. (a) True (b) False
  27. 27.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  28. 28.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
  29. 29.🪝 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)
  30. 30.🪝 A load of 180 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  31. 31.🪝 A pulley system lifts a 400 N load with an effort of 100 N. What is its mechanical advantage (MA)?
  32. 32.🪝 A winch has a wheel of radius 21 cm and an axle of radius 3 cm. What effort on the wheel lifts a 280 N bucket on the axle, in newtons? (ideal)
  33. 33.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
  34. 34.🪝 A load of 320 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  35. 35.True or false: a fixed pulley rises with the load. (a) True (b) False
  36. 36.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
  37. 37.🪝 A winch has a wheel of radius 40 cm and an axle of radius 5 cm. What effort on the wheel lifts a 1360 N bucket on the axle, in newtons? (ideal)
  38. 38.🪝 A pulley system lifts a 100 N load with an effort of 50 N. What is its mechanical advantage (MA)?
  39. 39.🪝 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)
  40. 40.True or false: a movable pulley halves the effort. (a) False (b) True

Answer key

  1. 7
  2. 2
  3. 2
  4. 40
  5. 5
  6. True
  7. 4
  8. 80
  9. a fixed pulley
  10. a fixed pulley
  11. a fixed pulley
  12. the direction of pull
  13. True
  14. 60
  15. 2
  16. True
  17. a smaller rod (axle)
  18. 4
  19. 200
  20. 40
  21. 6
  22. 270
  23. a movable pulley
  24. a movable pulley
  25. 6
  26. False
  27. 4
  28. False
  29. 80
  30. 60
  31. 4
  32. 40
  33. a movable pulley
  34. 160
  35. False
  36. False
  37. 170
  38. 2
  39. 180
  40. True

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