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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 898 · 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 210 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  2. 2.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
  3. 3.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
  4. 4.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
  5. 5.🪝 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
  6. 6.🪝 A pulley system lifts a 330 N load with an effort of 110 N. What is its mechanical advantage (MA)?
  7. 7.🪝 A pulley system lifts a 1040 N load with an effort of 260 N. What is its mechanical advantage (MA)?
  8. 8.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  9. 9.🪝 A well winch has a handle (wheel) of radius 40 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  10. 10.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  11. 11.🪝 A well winch has a handle (wheel) of radius 18 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  12. 12.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
  13. 13.🪝 A pulley system lifts a 220 N load with an effort of 110 N. What is its mechanical advantage (MA)?
  14. 14.🪝 A bucket weighing 280 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  15. 15.🪝 A load of 800 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 hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  17. 17.True or false: a fixed pulley rises with the load. (a) True (b) False
  18. 18.🪝 A bucket weighing 70 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  19. 19.🪝 A pulley system lifts a 1000 N load with an effort of 250 N. What is its mechanical advantage (MA)?
  20. 20.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
  21. 21.🪝 A load of 120 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  22. 22.🪝 A pulley system lifts an 840 N load with an effort of 210 N. What is its mechanical advantage (MA)?
  23. 23.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
  24. 24.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
  25. 25.🪝 More rope sections holding a load means … (a) the load floats (b) more effort needed (c) less effort needed (d) no change
  26. 26.🪝 A load of 1080 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  27. 27.🪝 A bucket weighing 370 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  28. 28.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
  29. 29.True or false: a movable pulley needs effort = load. (a) False (b) True
  30. 30.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a smaller rod (axle) (c) a flat ramp (d) a loose rope
  31. 31.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
  32. 32.🪝 A winch has a wheel of radius 9 cm and an axle of radius 3 cm. What effort on the wheel lifts a 120 N bucket on the axle, in newtons? (ideal)
  33. 33.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
  34. 34.🪝 A pulley system lifts a 140 N load with an effort of 70 N. What is its mechanical advantage (MA)?
  35. 35.🪝 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?
  36. 36.🪝 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?
  37. 37.🪝 A pulley system lifts a 1080 N load with an effort of 270 N. What is its mechanical advantage (MA)?
  38. 38.True or false: a movable pulley rises with the load. (a) False (b) True
  39. 39.🪝 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?
  40. 40.🪝 A bucket weighing 170 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. 70
  2. a fixed pulley
  3. 20
  4. True
  5. the direction of pull
  6. 3
  7. 4
  8. a movable pulley
  9. 8
  10. a fixed pulley
  11. 6
  12. a fixed pulley
  13. 2
  14. 280
  15. 200
  16. a movable pulley
  17. False
  18. 70
  19. 4
  20. a fixed pulley
  21. 30
  22. 4
  23. 16
  24. True
  25. less effort needed
  26. 270
  27. 370
  28. 4
  29. False
  30. a smaller rod (axle)
  31. False
  32. 40
  33. 7
  34. 2
  35. 27
  36. 14
  37. 4
  38. True
  39. 40
  40. 170

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