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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 440 · 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 load of 870 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  2. 2.True or false: a movable pulley only changes direction. (a) False (b) True
  3. 3.True or false: a fixed pulley needs effort = load. (a) False (b) True
  4. 4.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  5. 5.🪝 A load of 160 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  6. 6.True or false: a fixed pulley stays in one place. (a) False (b) True
  7. 7.🪝 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)
  8. 8.🪝 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)
  9. 9.🪝 A load of 680 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  10. 10.True or false: a fixed pulley rises with the load. (a) False (b) True
  11. 11.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
  12. 12.True or false: a movable pulley rises with the load. (a) True (b) False
  13. 13.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a sharp wedge (c) a smaller rod (axle) (d) a loose rope
  14. 14.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
  15. 15.🪝 A pulley system lifts a 600 N load with an effort of 300 N. What is its mechanical advantage (MA)?
  16. 16.🪝 A winch has a wheel of radius 15 cm and an axle of radius 3 cm. What effort on the wheel lifts a 900 N bucket on the axle, in newtons? (ideal)
  17. 17.🪝 A pulley system lifts a 180 N load with an effort of 90 N. What is its mechanical advantage (MA)?
  18. 18.🪝 A load of 840 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  19. 19.🪝 A winch has a wheel of radius 6 cm and an axle of radius 2 cm. What effort on the wheel lifts a 420 N bucket on the axle, in newtons? (ideal)
  20. 20.🪝 More rope sections holding a load means … (a) no change (b) less effort needed (c) more effort needed (d) the load floats
  21. 21.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  22. 22.True or false: a movable pulley needs effort = load. (a) True (b) False
  23. 23.True or false: a movable pulley halves the effort. (a) True (b) False
  24. 24.🪝 A well winch has a handle (wheel) of radius 18 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  25. 25.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
  26. 26.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) gravity (d) the direction of pull
  27. 27.🪝 A winch has a wheel of radius 20 cm and an axle of radius 5 cm. What effort on the wheel lifts a 120 N bucket on the axle, in newtons? (ideal)
  28. 28.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  29. 29.🪝 A pulley system lifts an 80 N load with an effort of 40 N. What is its mechanical advantage (MA)?
  30. 30.True or false: a fixed pulley halves the effort. (a) True (b) False
  31. 31.🪝 A winch has a wheel of radius 20 cm and an axle of radius 4 cm. What effort on the wheel lifts a 600 N bucket on the axle, in newtons? (ideal)
  32. 32.🪝 A bucket weighing 350 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  33. 33.🪝 A pulley system lifts a 440 N load with an effort of 110 N. What is its mechanical advantage (MA)?
  34. 34.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
  35. 35.🪝 A load of 220 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  36. 36.🪝 A winch has a wheel of radius 20 cm and an axle of radius 4 cm. What effort on the wheel lifts a 400 N bucket on the axle, in newtons? (ideal)
  37. 37.🪝 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)
  38. 38.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  39. 39.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
  40. 40.🪝 A well winch has a handle (wheel) of radius 32 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?

Answer key

  1. 290
  2. False
  3. True
  4. a movable pulley
  5. 80
  6. True
  7. 110
  8. 40
  9. 170
  10. False
  11. a movable pulley
  12. True
  13. a smaller rod (axle)
  14. a fixed pulley
  15. 2
  16. 180
  17. 2
  18. 280
  19. 140
  20. less effort needed
  21. a movable pulley
  22. False
  23. True
  24. 6
  25. a fixed pulley
  26. the direction of pull
  27. 30
  28. a fixed pulley
  29. 2
  30. False
  31. 120
  32. 350
  33. 4
  34. 3
  35. 110
  36. 80
  37. 30
  38. a fixed pulley
  39. True
  40. 8

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