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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 415 · 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 bucket weighing 430 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  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 load of 540 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  4. 4.🪝 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?
  5. 5.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
  6. 6.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
  7. 7.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
  8. 8.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  9. 9.🪝 A winch has a wheel of radius 20 cm and an axle of radius 5 cm. What effort on the wheel lifts a 120 N bucket on the axle, in newtons? (ideal)
  10. 10.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  11. 11.True or false: a fixed pulley needs effort = load. (a) True (b) False
  12. 12.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
  13. 13.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
  14. 14.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  15. 15.🪝 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
  16. 16.True or false: a fixed pulley halves the effort. (a) False (b) True
  17. 17.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
  18. 18.🪝 A winch has a wheel of radius 6 cm and an axle of radius 1 cm. What effort on the wheel lifts a 420 N bucket on the axle, in newtons? (ideal)
  19. 19.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
  20. 20.🪝 What does a single fixed pulley change? (a) gravity (b) the direction of pull (c) the colour of rope (d) the size of the load
  21. 21.True or false: a fixed pulley rises with the load. (a) False (b) True
  22. 22.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
  23. 23.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
  24. 24.🪝 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)
  25. 25.True or false: a movable pulley halves the effort. (a) False (b) True
  26. 26.🪝 A winch has a wheel of radius 24 cm and an axle of radius 3 cm. What effort on the wheel lifts a 1440 N bucket on the axle, in newtons? (ideal)
  27. 27.🪝 A pulley system lifts a 120 N load with an effort of 40 N. What is its mechanical advantage (MA)?
  28. 28.🪝 A pulley system lifts a 600 N load with an effort of 300 N. What is its mechanical advantage (MA)?
  29. 29.🪝 A load of 150 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  30. 30.🪝 A winch has a wheel of radius 9 cm and an axle of radius 3 cm. What effort on the wheel lifts a 210 N bucket on the axle, in newtons? (ideal)
  31. 31.True or false: a fixed pulley only changes direction. (a) False (b) True
  32. 32.🪝 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)
  33. 33.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
  34. 34.🪝 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)
  35. 35.🪝 A well winch has a handle (wheel) of radius 35 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  36. 36.True or false: a fixed pulley stays in one place. (a) True (b) False
  37. 37.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
  38. 38.🪝 A pulley system lifts a 60 N load with an effort of 30 N. What is its mechanical advantage (MA)?
  39. 39.🪝 A well winch has a handle (wheel) of radius 9 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  40. 40.🪝 A pulley system lifts a 360 N load with an effort of 180 N. What is its mechanical advantage (MA)?

Answer key

  1. 430
  2. less effort needed
  3. 180
  4. 6
  5. a fixed pulley
  6. a fixed pulley
  7. False
  8. 2
  9. 30
  10. a fixed pulley
  11. True
  12. 10
  13. True
  14. 2
  15. a smaller rod (axle)
  16. False
  17. True
  18. 70
  19. 8
  20. the direction of pull
  21. False
  22. False
  23. 24
  24. 320
  25. True
  26. 180
  27. 3
  28. 2
  29. 50
  30. 70
  31. True
  32. 280
  33. a movable pulley
  34. 30
  35. 7
  36. True
  37. 3
  38. 2
  39. 3
  40. 2

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