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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 230 · 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.🪝 More rope sections holding a load means … (a) more effort needed (b) less effort needed (c) the load floats (d) no change
  2. 2.🪝 A load of 600 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  3. 3.🪝 What does a single fixed pulley change? (a) the direction of pull (b) gravity (c) the size of the load (d) the colour of rope
  4. 4.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
  5. 5.True or false: a movable pulley only changes direction. (a) False (b) True
  6. 6.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a flat ramp (c) a loose rope (d) a smaller rod (axle)
  7. 7.True or false: a movable pulley is on a flagpole top. (a) False (b) True
  8. 8.🪝 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)
  9. 9.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  10. 10.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
  11. 11.🪝 A winch has a wheel of radius 20 cm and an axle of radius 5 cm. What effort on the wheel lifts a 360 N bucket on the axle, in newtons? (ideal)
  12. 12.🪝 A bucket weighing 90 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.True or false: a movable pulley halves the effort. (a) True (b) False
  14. 14.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  15. 15.🪝 A load of 540 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  16. 16.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  17. 17.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  18. 18.True or false: a movable pulley stays in one place. (a) False (b) True
  19. 19.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
  20. 20.🪝 A load of 320 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  21. 21.🪝 A pulley system lifts a 520 N load with an effort of 130 N. What is its mechanical advantage (MA)?
  22. 22.🪝 A pulley system lifts a 560 N load with an effort of 280 N. What is its mechanical advantage (MA)?
  23. 23.🪝 A pulley system lifts a 780 N load with an effort of 260 N. What is its mechanical advantage (MA)?
  24. 24.🪝 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)
  25. 25.🪝 A bucket weighing 200 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  26. 26.🪝 A bucket weighing 40 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  27. 27.🪝 A load of 480 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  28. 28.🪝 A load of 780 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  29. 29.🪝 A winch has a wheel of radius 12 cm and an axle of radius 2 cm. What effort on the wheel lifts a 1020 N bucket on the axle, in newtons? (ideal)
  30. 30.True or false: a movable pulley needs effort = load. (a) False (b) True
  31. 31.True or false: a fixed pulley halves the effort. (a) True (b) False
  32. 32.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
  33. 33.True or false: a fixed pulley needs effort = load. (a) False (b) True
  34. 34.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 320 N bucket on the axle, in newtons? (ideal)
  35. 35.🪝 A winch has a wheel of radius 8 cm and an axle of radius 2 cm. What effort on the wheel lifts a 760 N bucket on the axle, in newtons? (ideal)
  36. 36.🪝 A pulley system lifts a 400 N load with an effort of 100 N. What is its mechanical advantage (MA)?
  37. 37.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
  38. 38.🪝 A pulley system lifts a 40 N load with an effort of 20 N. What is its mechanical advantage (MA)?
  39. 39.🪝 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?
  40. 40.True or false: a fixed pulley stays in one place. (a) False (b) True

Answer key

  1. less effort needed
  2. 200
  3. the direction of pull
  4. True
  5. False
  6. a smaller rod (axle)
  7. False
  8. 360
  9. a fixed pulley
  10. a movable pulley
  11. 90
  12. 90
  13. True
  14. a fixed pulley
  15. 180
  16. a movable pulley
  17. a fixed pulley
  18. False
  19. 36
  20. 160
  21. 4
  22. 2
  23. 3
  24. 110
  25. 200
  26. 40
  27. 240
  28. 260
  29. 170
  30. False
  31. False
  32. a movable pulley
  33. True
  34. 160
  35. 190
  36. 4
  37. 20
  38. 2
  39. 7
  40. True

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