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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 482 · 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 well winch has a handle (wheel) of radius 15 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  2. 2.🪝 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)
  3. 3.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  4. 4.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 180 N bucket on the axle, in newtons? (ideal)
  5. 5.🪝 A bucket weighing 120 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  6. 6.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
  7. 7.🪝 More rope sections holding a load means … (a) the load floats (b) more effort needed (c) no change (d) less effort needed
  8. 8.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
  9. 9.🪝 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?
  10. 10.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  11. 11.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
  12. 12.🪝 A pulley system lifts a 1040 N load with an effort of 260 N. What is its mechanical advantage (MA)?
  13. 13.🪝 A pulley system lifts a 240 N load with an effort of 60 N. What is its mechanical advantage (MA)?
  14. 14.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
  15. 15.True or false: a movable pulley stays in one place. (a) True (b) False
  16. 16.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
  17. 17.🪝 A winch has a wheel of radius 25 cm and an axle of radius 5 cm. What effort on the wheel lifts a 200 N bucket on the axle, in newtons? (ideal)
  18. 18.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
  19. 19.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the direction of pull (c) gravity (d) the size of the load
  20. 20.🪝 A bucket weighing 110 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  21. 21.True or false: a movable pulley needs effort = load. (a) True (b) False
  22. 22.🪝 A well winch has a handle (wheel) of radius 35 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  23. 23.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
  24. 24.🪝 A load of 200 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 fixed pulley rises with the load. (a) True (b) False
  26. 26.🪝 A winch has a wheel of radius 15 cm and an axle of radius 5 cm. What effort on the wheel lifts a 240 N bucket on the axle, in newtons? (ideal)
  27. 27.🪝 A load of 240 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  28. 28.🪝 A winch has a wheel of radius 2 cm and an axle of radius 1 cm. What effort on the wheel lifts a 180 N bucket on the axle, in newtons? (ideal)
  29. 29.🪝 A bucket weighing 400 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.🪝 A bucket weighing 100 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  31. 31.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  32. 32.True or false: a fixed pulley only changes direction. (a) False (b) True
  33. 33.True or false: a movable pulley halves the effort. (a) True (b) False
  34. 34.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a loose rope (c) a smaller rod (axle) (d) a sharp wedge
  35. 35.🪝 A bucket weighing 380 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 bucket weighing 180 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  37. 37.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
  38. 38.True or false: a movable pulley rises with the load. (a) True (b) False
  39. 39.True or false: a fixed pulley halves the effort. (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. 5
  2. 450
  3. a fixed pulley
  4. 90
  5. 120
  6. a movable pulley
  7. less effort needed
  8. a movable pulley
  9. 8
  10. a movable pulley
  11. a fixed pulley
  12. 4
  13. 4
  14. a movable pulley
  15. False
  16. True
  17. 40
  18. False
  19. the direction of pull
  20. 110
  21. False
  22. 7
  23. 2
  24. 50
  25. False
  26. 80
  27. 60
  28. 90
  29. 400
  30. 100
  31. a fixed pulley
  32. True
  33. True
  34. a smaller rod (axle)
  35. 380
  36. 180
  37. True
  38. True
  39. False
  40. 70

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