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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 57 · 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.True or false: a movable pulley is on a flagpole top. (a) True (b) False
  2. 2.True or false: a movable pulley stays in one place. (a) False (b) True
  3. 3.🪝 A winch has a wheel of radius 6 cm and an axle of radius 2 cm. What effort on the wheel lifts a 210 N bucket on the axle, in newtons? (ideal)
  4. 4.🪝 A load of 40 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  5. 5.🪝 What does a single fixed pulley change? (a) gravity (b) the size of the load (c) the colour of rope (d) the direction of pull
  6. 6.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a smaller rod (axle) (c) a flat ramp (d) a loose rope
  7. 7.🪝 A well winch has a handle (wheel) of radius 2 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  8. 8.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
  9. 9.🪝 A pulley system lifts a 540 N load with an effort of 270 N. What is its mechanical advantage (MA)?
  10. 10.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  11. 11.🪝 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)
  12. 12.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
  13. 13.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  14. 14.True or false: a movable pulley halves the effort. (a) True (b) False
  15. 15.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  16. 16.🪝 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?
  17. 17.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  18. 18.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  19. 19.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
  20. 20.🪝 More rope sections holding a load means … (a) the load floats (b) no change (c) more effort needed (d) less effort needed
  21. 21.🪝 A load of 300 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  22. 22.True or false: a fixed pulley makes you pull 2× rope. (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.True or false: a fixed pulley needs effort = load. (a) False (b) True
  25. 25.True or false: a fixed pulley halves the effort. (a) True (b) False
  26. 26.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
  27. 27.True or false: a movable pulley only changes direction. (a) True (b) False
  28. 28.🪝 A well winch has a handle (wheel) of radius 28 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  29. 29.True or false: a fixed pulley rises with the load. (a) False (b) True
  30. 30.🪝 A bucket weighing 300 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.🪝 A bucket weighing 240 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 winch has a wheel of radius 10 cm and an axle of radius 2 cm. What effort on the wheel lifts a 150 N bucket on the axle, in newtons? (ideal)
  33. 33.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  34. 34.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
  35. 35.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  36. 36.🪝 A well winch has a handle (wheel) of radius 21 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  37. 37.🪝 A load of 510 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.🪝 A bucket weighing 390 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  39. 39.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  40. 40.🪝 A pulley system lifts a 240 N load with an effort of 60 N. What is its mechanical advantage (MA)?

Answer key

  1. False
  2. False
  3. 70
  4. 20
  5. the direction of pull
  6. a smaller rod (axle)
  7. 2
  8. a fixed pulley
  9. 2
  10. a fixed pulley
  11. 150
  12. True
  13. 5
  14. True
  15. 3
  16. 3
  17. a fixed pulley
  18. 8
  19. a movable pulley
  20. less effort needed
  21. 100
  22. False
  23. 2
  24. True
  25. False
  26. a movable pulley
  27. False
  28. 7
  29. False
  30. 300
  31. 240
  32. 30
  33. 5
  34. True
  35. 2
  36. 7
  37. 170
  38. 390
  39. a movable pulley
  40. 4

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