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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 242 · 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.🪝 What does a single fixed pulley change? (a) gravity (b) the colour of rope (c) the size of the load (d) the direction of pull
  2. 2.🪝 A load of 630 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.🪝 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
  4. 4.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
  5. 5.True or false: a movable pulley halves the effort. (a) False (b) True
  6. 6.🪝 A bucket weighing 230 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  7. 7.True or false: a fixed pulley needs effort = load. (a) True (b) False
  8. 8.True or false: a movable pulley is on a flagpole top. (a) False (b) True
  9. 9.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
  10. 10.🪝 A pulley system lifts a 780 N load with an effort of 260 N. What is its mechanical advantage (MA)?
  11. 11.True or false: a movable pulley rises with the load. (a) True (b) False
  12. 12.🪝 More rope sections holding a load means … (a) no change (b) more effort needed (c) less effort needed (d) the load floats
  13. 13.🪝 A winch has a wheel of radius 20 cm and an axle of radius 4 cm. What effort on the wheel lifts a 900 N bucket on the axle, in newtons? (ideal)
  14. 14.🪝 A winch has a wheel of radius 12 cm and an axle of radius 4 cm. What effort on the wheel lifts a 90 N bucket on the axle, in newtons? (ideal)
  15. 15.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
  16. 16.🪝 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)
  17. 17.🪝 A winch has a wheel of radius 6 cm and an axle of radius 3 cm. What effort on the wheel lifts a 200 N bucket on the axle, in newtons? (ideal)
  18. 18.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  19. 19.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
  20. 20.True or false: a movable pulley only changes direction. (a) False (b) True
  21. 21.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  22. 22.🪝 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?
  23. 23.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
  24. 24.🪝 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)
  25. 25.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
  26. 26.🪝 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)
  27. 27.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  28. 28.True or false: a fixed pulley stays in one place. (a) False (b) True
  29. 29.🪝 A well winch has a handle (wheel) of radius 7 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  30. 30.True or false: a fixed pulley rises with the load. (a) False (b) True
  31. 31.🪝 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)
  32. 32.🪝 A pulley system lifts a 60 N load with an effort of 30 N. What is its mechanical advantage (MA)?
  33. 33.🪝 A bucket weighing 370 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  34. 34.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
  35. 35.True or false: a movable pulley stays in one place. (a) True (b) False
  36. 36.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
  37. 37.🪝 A load of 600 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  38. 38.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
  39. 39.🪝 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?
  40. 40.🪝 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)

Answer key

  1. the direction of pull
  2. 210
  3. a smaller rod (axle)
  4. False
  5. True
  6. 230
  7. True
  8. False
  9. a movable pulley
  10. 3
  11. True
  12. less effort needed
  13. 180
  14. 30
  15. 15
  16. 80
  17. 100
  18. 2
  19. a fixed pulley
  20. False
  21. a fixed pulley
  22. 36
  23. True
  24. 180
  25. 6
  26. 70
  27. a movable pulley
  28. True
  29. 7
  30. False
  31. 200
  32. 2
  33. 370
  34. False
  35. False
  36. 20
  37. 300
  38. a movable pulley
  39. 2
  40. 150

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