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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 897 · 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 300 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.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
  3. 3.🪝 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)
  4. 4.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a flat ramp (c) a loose rope (d) a smaller rod (axle)
  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 has 4 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
  7. 7.🪝 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?
  8. 8.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
  9. 9.True or false: a movable pulley only changes direction. (a) True (b) False
  10. 10.True or false: a fixed pulley stays in one place. (a) True (b) False
  11. 11.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  12. 12.True or false: a fixed pulley rises with the load. (a) True (b) False
  13. 13.True or false: a fixed pulley only changes direction. (a) False (b) True
  14. 14.🪝 More rope sections holding a load means … (a) the load floats (b) no change (c) less effort needed (d) more effort needed
  15. 15.🪝 A pulley system lifts a 260 N load with an effort of 130 N. What is its mechanical advantage (MA)?
  16. 16.🪝 A load of 1200 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  17. 17.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  18. 18.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
  19. 19.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
  20. 20.True or false: a movable pulley rises with the load. (a) True (b) False
  21. 21.🪝 A winch has a wheel of radius 24 cm and an axle of radius 3 cm. What effort on the wheel lifts a 160 N bucket on the axle, in newtons? (ideal)
  22. 22.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
  23. 23.🪝 A load of 360 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  24. 24.True or false: a fixed pulley halves the effort. (a) False (b) True
  25. 25.True or false: a movable pulley needs effort = load. (a) True (b) False
  26. 26.🪝 A winch has a wheel of radius 25 cm and an axle of radius 5 cm. What effort on the wheel lifts an 800 N bucket on the axle, in newtons? (ideal)
  27. 27.🪝 A winch has a wheel of radius 8 cm and an axle of radius 1 cm. What effort on the wheel lifts a 1280 N bucket on the axle, in newtons? (ideal)
  28. 28.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  29. 29.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  30. 30.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
  31. 31.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  32. 32.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
  33. 33.🪝 A bucket weighing 30 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 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)
  35. 35.🪝 A pulley system lifts a 450 N load with an effort of 150 N. What is its mechanical advantage (MA)?
  36. 36.🪝 A bucket weighing 260 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  37. 37.🪝 A winch has a wheel of radius 3 cm and an axle of radius 1 cm. What effort on the wheel lifts a 360 N bucket on the axle, in newtons? (ideal)
  38. 38.🪝 A pulley system lifts a 680 N load with an effort of 170 N. What is its mechanical advantage (MA)?
  39. 39.🪝 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?
  40. 40.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley

Answer key

  1. 150
  2. True
  3. 180
  4. a smaller rod (axle)
  5. the direction of pull
  6. 28
  7. 16
  8. 12
  9. False
  10. True
  11. 3
  12. False
  13. True
  14. less effort needed
  15. 2
  16. 300
  17. a fixed pulley
  18. a fixed pulley
  19. True
  20. True
  21. 20
  22. a fixed pulley
  23. 90
  24. False
  25. False
  26. 160
  27. 160
  28. a movable pulley
  29. 2
  30. False
  31. a movable pulley
  32. False
  33. 30
  34. 50
  35. 3
  36. 260
  37. 120
  38. 4
  39. 4
  40. a movable pulley

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