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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 283 · 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 230 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.True or false: a movable pulley halves the effort. (a) False (b) True
  3. 3.🪝 A winch has a wheel of radius 20 cm and an axle of radius 4 cm. What effort on the wheel lifts a 400 N bucket on the axle, in newtons? (ideal)
  4. 4.🪝 A bucket weighing 490 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  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.🪝 More rope sections holding a load means … (a) the load floats (b) no change (c) more effort needed (d) less effort needed
  7. 7.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
  8. 8.🪝 A pulley system lifts an 840 N load with an effort of 280 N. What is its mechanical advantage (MA)?
  9. 9.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
  10. 10.🪝 A load of 320 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  11. 11.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  12. 12.🪝 A bucket weighing 480 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  13. 13.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  14. 14.🪝 A pulley system lifts a 320 N load with an effort of 160 N. What is its mechanical advantage (MA)?
  15. 15.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
  16. 16.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
  17. 17.🪝 A well winch has a handle (wheel) of radius 9 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  18. 18.🪝 A bucket weighing 420 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  19. 19.True or false: a fixed pulley only changes direction. (a) True (b) False
  20. 20.🪝 A winch has a wheel of radius 8 cm and an axle of radius 1 cm. What effort on the wheel lifts a 960 N bucket on the axle, in newtons? (ideal)
  21. 21.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
  22. 22.True or false: a movable pulley is on a flagpole top. (a) True (b) False
  23. 23.🪝 A winch has a wheel of radius 20 cm and an axle of radius 4 cm. What effort on the wheel lifts a 550 N bucket on the axle, in newtons? (ideal)
  24. 24.🪝 A load of 1080 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  25. 25.True or false: a movable pulley rises with the load. (a) True (b) False
  26. 26.True or false: a movable pulley only changes direction. (a) True (b) False
  27. 27.🪝 A winch has a wheel of radius 28 cm and an axle of radius 4 cm. What effort on the wheel lifts a 490 N bucket on the axle, in newtons? (ideal)
  28. 28.True or false: a movable pulley needs effort = load. (a) False (b) True
  29. 29.🪝 A pulley system lifts a 720 N load with an effort of 240 N. What is its mechanical advantage (MA)?
  30. 30.🪝 A winch has a wheel of radius 16 cm and an axle of radius 4 cm. What effort on the wheel lifts a 320 N bucket on the axle, in newtons? (ideal)
  31. 31.🪝 A winch has a wheel of radius 10 cm and an axle of radius 2 cm. What effort on the wheel lifts a 200 N bucket on the axle, in newtons? (ideal)
  32. 32.🪝 A load of 120 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  33. 33.🪝 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?
  34. 34.True or false: a fixed pulley halves the effort. (a) False (b) True
  35. 35.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 40 N bucket on the axle, in newtons? (ideal)
  36. 36.True or false: a fixed pulley rises with the load. (a) False (b) True
  37. 37.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  38. 38.🪝 A well winch has a handle (wheel) of radius 28 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  39. 39.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
  40. 40.True or false: a fixed pulley needs effort = load. (a) True (b) False

Answer key

  1. 230
  2. True
  3. 80
  4. 490
  5. the direction of pull
  6. less effort needed
  7. False
  8. 3
  9. True
  10. 160
  11. 5
  12. 480
  13. a movable pulley
  14. 2
  15. a movable pulley
  16. True
  17. 3
  18. 420
  19. True
  20. 120
  21. a movable pulley
  22. False
  23. 110
  24. 270
  25. True
  26. False
  27. 70
  28. False
  29. 3
  30. 80
  31. 40
  32. 60
  33. 6
  34. False
  35. 20
  36. False
  37. 2
  38. 7
  39. 15
  40. True

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