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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 25 · 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.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  2. 2.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
  3. 3.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
  4. 4.True or false: a fixed pulley only changes direction. (a) True (b) False
  5. 5.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
  6. 6.🪝 More rope sections holding a load means … (a) no change (b) the load floats (c) less effort needed (d) more effort needed
  7. 7.🪝 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)
  8. 8.🪝 What does a single fixed pulley change? (a) gravity (b) the colour of rope (c) the direction of pull (d) the size of the load
  9. 9.🪝 A bucket weighing 150 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  10. 10.True or false: a movable pulley stays in one place. (a) True (b) False
  11. 11.True or false: a movable pulley only changes direction. (a) True (b) False
  12. 12.🪝 A load of 400 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  13. 13.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
  14. 14.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  15. 15.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a sharp wedge (c) a smaller rod (axle) (d) a flat ramp
  16. 16.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  17. 17.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  18. 18.True or false: a fixed pulley halves the effort. (a) True (b) False
  19. 19.🪝 A well winch has a handle (wheel) of radius 7 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  20. 20.🪝 A load of 800 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  21. 21.True or false: a fixed pulley stays in one place. (a) True (b) False
  22. 22.🪝 A bucket weighing 240 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  23. 23.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
  24. 24.True or false: a fixed pulley needs effort = load. (a) False (b) True
  25. 25.🪝 A pulley system lifts a 240 N load with an effort of 120 N. What is its mechanical advantage (MA)?
  26. 26.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
  27. 27.🪝 A pulley system lifts a 340 N load with an effort of 170 N. What is its mechanical advantage (MA)?
  28. 28.🪝 A pulley system lifts a 160 N load with an effort of 40 N. What is its mechanical advantage (MA)?
  29. 29.🪝 A pulley system lifts a 480 N load with an effort of 120 N. What is its mechanical advantage (MA)?
  30. 30.🪝 A winch has a wheel of radius 40 cm and an axle of radius 5 cm. What effort on the wheel lifts a 240 N bucket on the axle, in newtons? (ideal)
  31. 31.🪝 A bucket weighing 320 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  32. 32.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  33. 33.🪝 A well winch has a handle (wheel) of radius 24 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  34. 34.🪝 A pulley system lifts a 180 N load with an effort of 90 N. What is its mechanical advantage (MA)?
  35. 35.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
  36. 36.🪝 A winch has a wheel of radius 30 cm and an axle of radius 5 cm. What effort on the wheel lifts a 1140 N bucket on the axle, in newtons? (ideal)
  37. 37.🪝 A winch has a wheel of radius 15 cm and an axle of radius 5 cm. What effort on the wheel lifts a 180 N bucket on the axle, in newtons? (ideal)
  38. 38.🪝 A load of 160 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  39. 39.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
  40. 40.🪝 A well winch has a handle (wheel) of radius 3 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?

Answer key

  1. a movable pulley
  2. a fixed pulley
  3. 6
  4. True
  5. 7
  6. less effort needed
  7. 480
  8. the direction of pull
  9. 150
  10. False
  11. False
  12. 200
  13. False
  14. a movable pulley
  15. a smaller rod (axle)
  16. a fixed pulley
  17. a fixed pulley
  18. False
  19. 7
  20. 200
  21. True
  22. 240
  23. a movable pulley
  24. True
  25. 2
  26. 9
  27. 2
  28. 4
  29. 4
  30. 30
  31. 320
  32. 6
  33. 6
  34. 2
  35. a fixed pulley
  36. 190
  37. 60
  38. 40
  39. 2
  40. 3

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