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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 370 · 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.True or false: a fixed pulley stays in one place. (a) False (b) True
  2. 2.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  3. 3.🪝 A well winch has a handle (wheel) of radius 2 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  4. 4.True or false: a movable pulley only changes direction. (a) True (b) False
  5. 5.🪝 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)
  6. 6.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  7. 7.True or false: a fixed pulley only changes direction. (a) True (b) False
  8. 8.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
  9. 9.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
  10. 10.🪝 A load of 440 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  11. 11.True or false: a movable pulley needs effort = load. (a) True (b) False
  12. 12.🪝 A winch has a wheel of radius 12 cm and an axle of radius 4 cm. What effort on the wheel lifts a 270 N bucket on the axle, in newtons? (ideal)
  13. 13.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  14. 14.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  15. 15.🪝 A pulley system lifts a 560 N load with an effort of 280 N. What is its mechanical advantage (MA)?
  16. 16.🪝 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)
  17. 17.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
  18. 18.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
  19. 19.🪝 A load of 450 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  20. 20.🪝 A winch has a wheel of radius 24 cm and an axle of radius 4 cm. What effort on the wheel lifts a 720 N bucket on the axle, in newtons? (ideal)
  21. 21.🪝 A load of 300 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  22. 22.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a sharp wedge (c) a loose rope (d) a flat ramp
  23. 23.🪝 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?
  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.🪝 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?
  26. 26.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
  27. 27.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
  28. 28.🪝 More rope sections holding a load means … (a) less effort needed (b) the load floats (c) no change (d) more effort needed
  29. 29.🪝 A bucket weighing 360 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 pulley system lifts a 680 N load with an effort of 170 N. What is its mechanical advantage (MA)?
  31. 31.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  32. 32.🪝 A winch has a wheel of radius 16 cm and an axle of radius 4 cm. What effort on the wheel lifts a 160 N bucket on the axle, in newtons? (ideal)
  33. 33.🪝 A pulley system lifts a 200 N load with an effort of 50 N. What is its mechanical advantage (MA)?
  34. 34.True or false: a movable pulley rises with the load. (a) True (b) False
  35. 35.🪝 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)
  36. 36.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
  37. 37.🪝 A winch has a wheel of radius 12 cm and an axle of radius 2 cm. What effort on the wheel lifts a 1200 N bucket on the axle, in newtons? (ideal)
  38. 38.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  39. 39.🪝 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
  40. 40.🪝 A pulley system lifts a 660 N load with an effort of 220 N. What is its mechanical advantage (MA)?

Answer key

  1. True
  2. a movable pulley
  3. 2
  4. False
  5. 60
  6. a movable pulley
  7. True
  8. 3
  9. a movable pulley
  10. 110
  11. False
  12. 90
  13. a fixed pulley
  14. a fixed pulley
  15. 2
  16. 270
  17. a fixed pulley
  18. True
  19. 150
  20. 120
  21. 150
  22. a smaller rod (axle)
  23. 18
  24. 270
  25. 8
  26. a fixed pulley
  27. a movable pulley
  28. less effort needed
  29. 360
  30. 4
  31. 4
  32. 40
  33. 4
  34. True
  35. 490
  36. False
  37. 200
  38. 6
  39. the direction of pull
  40. 3

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