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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 554 · 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.

NameDateTime takenScore ___ / 40
  1. 1.True or false: a fixed pulley halves the effort. (a) True (b) False
  2. 2.🪝 A winch has a wheel of radius 3 cm and an axle of radius 1 cm. What effort on the wheel lifts a 120 N bucket on the axle, in newtons? (ideal)
  3. 3.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  4. 4.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  5. 5.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) the direction of pull (d) gravity
  6. 6.🪝 A bucket weighing 260 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  7. 7.🪝 A load of 280 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  8. 8.🪝 A load of 570 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  9. 9.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
  10. 10.True or false: a movable pulley stays in one place. (a) False (b) True
  11. 11.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
  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.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
  14. 14.🪝 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)
  15. 15.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  16. 16.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
  17. 17.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
  18. 18.🪝 A pulley system lifts a 540 N load with an effort of 180 N. What is its mechanical advantage (MA)?
  19. 19.🪝 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?
  20. 20.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
  21. 21.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
  22. 22.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  23. 23.🪝 A bucket weighing 450 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 halves the effort? (a) a fixed pulley (b) a movable pulley
  25. 25.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
  26. 26.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a flat ramp (c) a smaller rod (axle) (d) a sharp wedge
  27. 27.🪝 A bucket weighing 330 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  28. 28.🪝 A bucket weighing 500 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  29. 29.True or false: a fixed pulley needs effort = load. (a) False (b) True
  30. 30.🪝 A well winch has a handle (wheel) of radius 21 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  31. 31.🪝 More rope sections holding a load means … (a) more effort needed (b) no change (c) the load floats (d) less effort needed
  32. 32.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  33. 33.True or false: a movable pulley is on a flagpole top. (a) True (b) False
  34. 34.🪝 A load of 920 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.True or false: a movable pulley rises with the load. (a) False (b) True
  36. 36.🪝 A well winch has a handle (wheel) of radius 25 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  37. 37.🪝 A bucket weighing 80 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  38. 38.🪝 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)
  39. 39.🪝 A well winch has a handle (wheel) of radius 3 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  40. 40.True or false: a movable pulley only changes direction. (a) False (b) True

Answer key

  1. False
  2. 40
  3. a fixed pulley
  4. 3
  5. the direction of pull
  6. 260
  7. 140
  8. 190
  9. False
  10. False
  11. a movable pulley
  12. 480
  13. 4
  14. 430
  15. 3
  16. a fixed pulley
  17. a movable pulley
  18. 3
  19. 6
  20. 8
  21. a fixed pulley
  22. 4
  23. 450
  24. a movable pulley
  25. 32
  26. a smaller rod (axle)
  27. 330
  28. 500
  29. True
  30. 7
  31. less effort needed
  32. a fixed pulley
  33. False
  34. 230
  35. True
  36. 5
  37. 80
  38. 230
  39. 3
  40. False

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