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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 204 · 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 270 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.🪝 A load of 690 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.🪝 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
  4. 4.True or false: a movable pulley only changes direction. (a) True (b) False
  5. 5.True or false: a fixed pulley only changes direction. (a) True (b) False
  6. 6.🪝 A pulley system lifts a 380 N load with an effort of 190 N. What is its mechanical advantage (MA)?
  7. 7.🪝 A load of 640 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  8. 8.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  9. 9.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
  10. 10.🪝 A pulley system lifts a 210 N load with an effort of 70 N. What is its mechanical advantage (MA)?
  11. 11.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  12. 12.🪝 A load of 270 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 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)
  14. 14.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
  15. 15.🪝 A load of 90 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  16. 16.🪝 More rope sections holding a load means … (a) the load floats (b) more effort needed (c) less effort needed (d) no change
  17. 17.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
  18. 18.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
  19. 19.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 400 N bucket on the axle, in newtons? (ideal)
  20. 20.🪝 A well winch has a handle (wheel) of radius 2 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  21. 21.🪝 A pulley system lifts a 1080 N load with an effort of 270 N. What is its mechanical advantage (MA)?
  22. 22.🪝 A pulley system lifts a 780 N load with an effort of 260 N. What is its mechanical advantage (MA)?
  23. 23.🪝 A load of 1160 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.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
  25. 25.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 220 N bucket on the axle, in newtons? (ideal)
  26. 26.🪝 A bucket weighing 390 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  27. 27.🪝 A pulley system lifts a 500 N load with an effort of 250 N. What is its mechanical advantage (MA)?
  28. 28.🪝 A winch has a wheel of radius 18 cm and an axle of radius 3 cm. What effort on the wheel lifts a 660 N bucket on the axle, in newtons? (ideal)
  29. 29.🪝 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)
  30. 30.True or false: a movable pulley is on a flagpole top. (a) True (b) False
  31. 31.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  32. 32.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a smaller rod (axle) (c) a sharp wedge (d) a flat ramp
  33. 33.🪝 A well winch has a handle (wheel) of radius 5 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  34. 34.🪝 A pulley system lifts a 60 N load with an effort of 20 N. What is its mechanical advantage (MA)?
  35. 35.🪝 A bucket weighing 300 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  36. 36.🪝 A pulley system lifts a 720 N load with an effort of 180 N. What is its mechanical advantage (MA)?
  37. 37.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  38. 38.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
  39. 39.True or false: a fixed pulley stays in one place. (a) False (b) True
  40. 40.🪝 A pulley system lifts a 360 N load with an effort of 90 N. What is its mechanical advantage (MA)?

Answer key

  1. 270
  2. 230
  3. the direction of pull
  4. False
  5. True
  6. 2
  7. 160
  8. 4
  9. True
  10. 3
  11. a fixed pulley
  12. 90
  13. 20
  14. True
  15. 30
  16. less effort needed
  17. True
  18. False
  19. 200
  20. 2
  21. 4
  22. 3
  23. 290
  24. 18
  25. 110
  26. 390
  27. 2
  28. 110
  29. 30
  30. False
  31. a fixed pulley
  32. a smaller rod (axle)
  33. 5
  34. 3
  35. 300
  36. 4
  37. 3
  38. a movable pulley
  39. True
  40. 4

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