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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 280 · 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 load of 260 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  2. 2.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
  3. 3.🪝 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?
  4. 4.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) gravity (d) the direction of pull
  5. 5.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
  6. 6.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
  7. 7.🪝 A pulley system lifts a 520 N load with an effort of 260 N. What is its mechanical advantage (MA)?
  8. 8.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a smaller rod (axle) (c) a loose rope (d) a flat ramp
  9. 9.🪝 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)
  10. 10.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
  11. 11.True or false: a movable pulley halves the effort. (a) True (b) False
  12. 12.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
  13. 13.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
  14. 14.True or false: a fixed pulley needs effort = load. (a) True (b) False
  15. 15.🪝 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)
  16. 16.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
  17. 17.🪝 More rope sections holding a load means … (a) more effort needed (b) less effort needed (c) the load floats (d) no change
  18. 18.🪝 A load of 100 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  19. 19.True or false: a fixed pulley rises with the load. (a) False (b) True
  20. 20.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
  21. 21.🪝 A pulley system lifts a 240 N load with an effort of 120 N. What is its mechanical advantage (MA)?
  22. 22.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  23. 23.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  24. 24.True or false: a fixed pulley halves the effort. (a) False (b) True
  25. 25.🪝 A load of 280 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 load of 180 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  27. 27.🪝 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?
  28. 28.🪝 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)
  29. 29.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
  30. 30.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  31. 31.🪝 A pulley system lifts an 880 N load with an effort of 220 N. What is its mechanical advantage (MA)?
  32. 32.🪝 A bucket weighing 120 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  33. 33.🪝 A bucket weighing 390 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  34. 34.🪝 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)
  35. 35.True or false: a fixed pulley only changes direction. (a) False (b) True
  36. 36.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  37. 37.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
  38. 38.True or false: a movable pulley only changes direction. (a) True (b) False
  39. 39.True or false: a movable pulley is on a flagpole top. (a) False (b) True
  40. 40.True or false: a movable pulley rises with the load. (a) False (b) True

Answer key

  1. 130
  2. a movable pulley
  3. 18
  4. the direction of pull
  5. False
  6. a fixed pulley
  7. 2
  8. a smaller rod (axle)
  9. 50
  10. 27
  11. True
  12. a movable pulley
  13. 4
  14. True
  15. 210
  16. a fixed pulley
  17. less effort needed
  18. 50
  19. False
  20. a movable pulley
  21. 2
  22. 2
  23. a fixed pulley
  24. False
  25. 70
  26. 90
  27. 6
  28. 200
  29. False
  30. 3
  31. 4
  32. 120
  33. 390
  34. 280
  35. True
  36. a movable pulley
  37. 14
  38. False
  39. False
  40. True

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