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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 231 · 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 fixed pulley is on a flagpole top. (a) False (b) True
  2. 2.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
  3. 3.🪝 A pulley system lifts a 100 N load with an effort of 50 N. What is its mechanical advantage (MA)?
  4. 4.True or false: a movable pulley halves the effort. (a) True (b) False
  5. 5.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
  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.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  8. 8.True or false: a movable pulley needs effort = load. (a) False (b) True
  9. 9.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
  10. 10.🪝 A load of 270 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  11. 11.🪝 More rope sections holding a load means … (a) no change (b) the load floats (c) more effort needed (d) less effort needed
  12. 12.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  13. 13.🪝 A winch has a wheel of radius 6 cm and an axle of radius 2 cm. What effort on the wheel lifts a 240 N bucket on the axle, in newtons? (ideal)
  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 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)
  16. 16.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
  17. 17.🪝 What does a single fixed pulley change? (a) gravity (b) the colour of rope (c) the direction of pull (d) the size of the load
  18. 18.🪝 A well winch has a handle (wheel) of radius 18 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  19. 19.🪝 A pulley system lifts a 300 N load with an effort of 150 N. What is its mechanical advantage (MA)?
  20. 20.🪝 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)
  21. 21.True or false: a movable pulley is on a flagpole top. (a) True (b) False
  22. 22.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
  23. 23.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
  24. 24.True or false: a fixed pulley needs effort = load. (a) False (b) True
  25. 25.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
  26. 26.True or false: a fixed pulley only changes direction. (a) False (b) True
  27. 27.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  28. 28.True or false: a movable pulley only changes direction. (a) False (b) True
  29. 29.🪝 A load of 500 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  30. 30.True or false: a fixed pulley halves the effort. (a) True (b) False
  31. 31.🪝 A load of 240 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  32. 32.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
  33. 33.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  34. 34.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  35. 35.True or false: a fixed pulley stays in one place. (a) False (b) True
  36. 36.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  37. 37.🪝 A winch has a wheel of radius 9 cm and an axle of radius 3 cm. What effort on the wheel lifts a 600 N bucket on the axle, in newtons? (ideal)
  38. 38.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
  39. 39.🪝 A well winch has a handle (wheel) of radius 21 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  40. 40.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a smaller rod (axle) (c) a sharp wedge (d) a loose rope

Answer key

  1. True
  2. False
  3. 2
  4. True
  5. True
  6. 290
  7. 3
  8. False
  9. a fixed pulley
  10. 90
  11. less effort needed
  12. a fixed pulley
  13. 80
  14. 2
  15. 180
  16. a fixed pulley
  17. the direction of pull
  18. 6
  19. 2
  20. 60
  21. False
  22. False
  23. a movable pulley
  24. True
  25. a movable pulley
  26. True
  27. a movable pulley
  28. False
  29. 250
  30. False
  31. 120
  32. 9
  33. 2
  34. a fixed pulley
  35. True
  36. 4
  37. 200
  38. 2
  39. 7
  40. a smaller rod (axle)

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