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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 576 · 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.

NameDateTime takenScore ___ / 40
  1. 1.🪝 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?
  2. 2.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
  3. 3.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
  4. 4.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
  5. 5.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
  6. 6.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
  7. 7.🪝 What does a single fixed pulley change? (a) the size of the load (b) the direction of pull (c) the colour of rope (d) gravity
  8. 8.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
  9. 9.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
  10. 10.True or false: a movable pulley halves the effort. (a) False (b) True
  11. 11.True or false: a movable pulley needs effort = load. (a) False (b) True
  12. 12.🪝 A pulley system lifts a 420 N load with an effort of 210 N. What is its mechanical advantage (MA)?
  13. 13.🪝 A winch has a wheel of radius 12 cm and an axle of radius 3 cm. What effort on the wheel lifts a 720 N bucket on the axle, in newtons? (ideal)
  14. 14.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
  15. 15.True or false: a movable pulley only changes direction. (a) False (b) True
  16. 16.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  17. 17.True or false: a fixed pulley halves the effort. (a) True (b) False
  18. 18.🪝 A bucket weighing 220 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  19. 19.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a sharp wedge (c) a flat ramp (d) a loose rope
  20. 20.True or false: a movable pulley rises with the load. (a) True (b) False
  21. 21.🪝 A winch has a wheel of radius 15 cm and an axle of radius 5 cm. What effort on the wheel lifts a 420 N bucket on the axle, in newtons? (ideal)
  22. 22.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
  23. 23.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  24. 24.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  25. 25.🪝 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)
  26. 26.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
  27. 27.🪝 A load of 880 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  28. 28.🪝 A pulley system lifts a 480 N load with an effort of 160 N. What is its mechanical advantage (MA)?
  29. 29.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  30. 30.🪝 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)
  31. 31.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
  32. 32.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
  33. 33.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 400 N bucket on the axle, in newtons? (ideal)
  34. 34.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
  35. 35.🪝 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)
  36. 36.True or false: a fixed pulley rises with the load. (a) True (b) False
  37. 37.True or false: a movable pulley is on a flagpole top. (a) False (b) True
  38. 38.🪝 More rope sections holding a load means … (a) more effort needed (b) no change (c) less effort needed (d) the load floats
  39. 39.True or false: a fixed pulley only changes direction. (a) True (b) False
  40. 40.🪝 A load of 390 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

Answer key

  1. 6
  2. a movable pulley
  3. a movable pulley
  4. 4
  5. True
  6. 6
  7. the direction of pull
  8. a movable pulley
  9. False
  10. True
  11. False
  12. 2
  13. 180
  14. a fixed pulley
  15. False
  16. a fixed pulley
  17. False
  18. 220
  19. a smaller rod (axle)
  20. True
  21. 140
  22. True
  23. 2
  24. 3
  25. 200
  26. a fixed pulley
  27. 220
  28. 3
  29. 5
  30. 350
  31. True
  32. a fixed pulley
  33. 200
  34. False
  35. 80
  36. False
  37. False
  38. less effort needed
  39. True
  40. 130

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