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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 891 · 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.🪝 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
  3. 3.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
  4. 4.🪝 A pulley system lifts a 180 N load with an effort of 90 N. What is its mechanical advantage (MA)?
  5. 5.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  6. 6.🪝 A bucket weighing 20 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  7. 7.🪝 A winch has a wheel of radius 9 cm and an axle of radius 3 cm. What effort on the wheel lifts a 540 N bucket on the axle, in newtons? (ideal)
  8. 8.🪝 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?
  9. 9.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
  10. 10.True or false: a fixed pulley only changes direction. (a) True (b) False
  11. 11.🪝 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)
  12. 12.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  13. 13.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) no change (d) less effort needed
  14. 14.🪝 A pulley system lifts a 1040 N load with an effort of 260 N. What is its mechanical advantage (MA)?
  15. 15.🪝 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
  16. 16.🪝 A bucket weighing 320 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.🪝 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)
  18. 18.🪝 A load of 330 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  19. 19.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
  20. 20.True or false: a fixed pulley needs effort = load. (a) False (b) True
  21. 21.True or false: a movable pulley stays in one place. (a) True (b) False
  22. 22.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
  23. 23.🪝 A load of 450 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  24. 24.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  25. 25.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 180 N bucket on the axle, in newtons? (ideal)
  26. 26.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
  27. 27.🪝 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)
  28. 28.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
  29. 29.True or false: a movable pulley only changes direction. (a) True (b) False
  30. 30.🪝 A pulley system lifts a 360 N load with an effort of 180 N. What is its mechanical advantage (MA)?
  31. 31.🪝 A winch has a wheel of radius 25 cm and an axle of radius 5 cm. What effort on the wheel lifts a 150 N bucket on the axle, in newtons? (ideal)
  32. 32.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
  33. 33.🪝 A load of 560 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  34. 34.🪝 A load of 480 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 stays in one place. (a) False (b) True
  36. 36.🪝 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?
  37. 37.🪝 A load of 580 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  38. 38.🪝 A pulley system lifts a 760 N load with an effort of 190 N. What is its mechanical advantage (MA)?
  39. 39.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  40. 40.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley

Answer key

  1. True
  2. a smaller rod (axle)
  3. a movable pulley
  4. 2
  5. a fixed pulley
  6. 20
  7. 180
  8. 3
  9. a movable pulley
  10. True
  11. 20
  12. a movable pulley
  13. less effort needed
  14. 4
  15. the direction of pull
  16. 320
  17. 200
  18. 110
  19. a fixed pulley
  20. True
  21. False
  22. 16
  23. 150
  24. 8
  25. 90
  26. a fixed pulley
  27. 200
  28. a fixed pulley
  29. False
  30. 2
  31. 30
  32. True
  33. 280
  34. 240
  35. True
  36. 6
  37. 290
  38. 4
  39. 4
  40. a movable pulley

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