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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 345 · 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 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?
  2. 2.🪝 More rope sections holding a load means … (a) no change (b) the load floats (c) less effort needed (d) more effort needed
  3. 3.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
  4. 4.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a loose rope (c) a sharp wedge (d) a flat ramp
  5. 5.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
  6. 6.🪝 A well winch has a handle (wheel) of radius 7 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  7. 7.True or false: a fixed pulley needs effort = load. (a) False (b) True
  8. 8.True or false: a fixed pulley only changes direction. (a) True (b) False
  9. 9.True or false: a movable pulley needs effort = load. (a) False (b) True
  10. 10.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
  11. 11.True or false: a movable pulley is on a flagpole top. (a) True (b) False
  12. 12.🪝 A load of 810 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  13. 13.🪝 A winch has a wheel of radius 16 cm and an axle of radius 4 cm. What effort on the wheel lifts a 160 N bucket on the axle, in newtons? (ideal)
  14. 14.🪝 A bucket weighing 90 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.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
  16. 16.🪝 A well winch has a handle (wheel) of radius 3 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  17. 17.🪝 A winch has a wheel of radius 12 cm and an axle of radius 3 cm. What effort on the wheel lifts a 280 N bucket on the axle, in newtons? (ideal)
  18. 18.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
  19. 19.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  20. 20.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
  21. 21.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
  22. 22.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  23. 23.🪝 A pulley system lifts a 140 N load with an effort of 70 N. What is its mechanical advantage (MA)?
  24. 24.🪝 A pulley system lifts a 60 N load with an effort of 30 N. What is its mechanical advantage (MA)?
  25. 25.🪝 What does a single fixed pulley change? (a) the colour of rope (b) gravity (c) the direction of pull (d) the size of the load
  26. 26.True or false: a movable pulley stays in one place. (a) False (b) True
  27. 27.True or false: a fixed pulley rises with the load. (a) False (b) True
  28. 28.🪝 A pulley system lifts a 240 N load with an effort of 80 N. What is its mechanical advantage (MA)?
  29. 29.True or false: a fixed pulley halves the effort. (a) False (b) True
  30. 30.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  31. 31.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 100 N bucket on the axle, in newtons? (ideal)
  32. 32.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
  33. 33.🪝 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?
  34. 34.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  35. 35.🪝 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)
  36. 36.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
  37. 37.🪝 A pulley system lifts a 150 N load with an effort of 50 N. What is its mechanical advantage (MA)?
  38. 38.🪝 A bucket weighing 440 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  39. 39.🪝 A pulley system lifts a 1200 N load with an effort of 300 N. What is its mechanical advantage (MA)?
  40. 40.🪝 A pulley system lifts a 180 N load with an effort of 90 N. What is its mechanical advantage (MA)?

Answer key

  1. 14
  2. less effort needed
  3. 6
  4. a smaller rod (axle)
  5. a movable pulley
  6. 7
  7. True
  8. True
  9. False
  10. True
  11. False
  12. 270
  13. 40
  14. 90
  15. False
  16. 3
  17. 70
  18. a movable pulley
  19. a fixed pulley
  20. a fixed pulley
  21. a movable pulley
  22. a fixed pulley
  23. 2
  24. 2
  25. the direction of pull
  26. False
  27. False
  28. 3
  29. False
  30. 8
  31. 50
  32. 30
  33. 40
  34. 2
  35. 20
  36. 24
  37. 3
  38. 440
  39. 4
  40. 2

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