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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 294 · 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 winch has a wheel of radius 6 cm and an axle of radius 1 cm. What effort on the wheel lifts a 180 N bucket on the axle, in newtons? (ideal)
  2. 2.🪝 A load of 870 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  3. 3.True or false: a fixed pulley only changes direction. (a) False (b) True
  4. 4.🪝 A pulley system lifts a 340 N load with an effort of 170 N. What is its mechanical advantage (MA)?
  5. 5.🪝 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)
  6. 6.🪝 A winch has a wheel of radius 40 cm and an axle of radius 5 cm. What effort on the wheel lifts a 640 N bucket on the axle, in newtons? (ideal)
  7. 7.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
  8. 8.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  9. 9.🪝 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?
  10. 10.True or false: a fixed pulley needs effort = load. (a) True (b) False
  11. 11.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
  12. 12.True or false: a movable pulley is on a flagpole top. (a) True (b) False
  13. 13.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  14. 14.True or false: a movable pulley halves the effort. (a) True (b) False
  15. 15.🪝 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)
  16. 16.🪝 A pulley system lifts a 680 N load with an effort of 170 N. What is its mechanical advantage (MA)?
  17. 17.🪝 A bucket weighing 140 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  18. 18.🪝 More rope sections holding a load means … (a) no change (b) the load floats (c) less effort needed (d) more effort needed
  19. 19.🪝 What does a single fixed pulley change? (a) the direction of pull (b) gravity (c) the size of the load (d) the colour of rope
  20. 20.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
  21. 21.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
  22. 22.🪝 A load of 750 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  23. 23.🪝 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)
  24. 24.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  25. 25.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
  26. 26.🪝 A load of 560 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.True or false: a movable pulley needs effort = load. (a) True (b) False
  28. 28.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
  29. 29.True or false: a movable pulley rises with the load. (a) True (b) False
  30. 30.🪝 A well winch has a handle (wheel) of radius 30 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  31. 31.🪝 A well winch has a handle (wheel) of radius 2 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  32. 32.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
  33. 33.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
  34. 34.🪝 A pulley system lifts a 660 N load with an effort of 220 N. What is its mechanical advantage (MA)?
  35. 35.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  36. 36.True or false: a movable pulley only changes direction. (a) True (b) False
  37. 37.True or false: a movable pulley stays in one place. (a) True (b) False
  38. 38.🪝 A pulley system lifts a 200 N load with an effort of 50 N. What is its mechanical advantage (MA)?
  39. 39.True or false: a fixed pulley rises with the load. (a) True (b) False
  40. 40.🪝 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)

Answer key

  1. 30
  2. 290
  3. True
  4. 2
  5. 110
  6. 80
  7. True
  8. a fixed pulley
  9. 8
  10. True
  11. True
  12. False
  13. 4
  14. True
  15. 170
  16. 4
  17. 140
  18. less effort needed
  19. the direction of pull
  20. False
  21. a movable pulley
  22. 250
  23. 20
  24. a movable pulley
  25. 8
  26. 140
  27. False
  28. a movable pulley
  29. True
  30. 6
  31. 2
  32. a movable pulley
  33. False
  34. 3
  35. a fixed pulley
  36. False
  37. False
  38. 4
  39. False
  40. 70

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