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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 304 · 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 winch has a wheel of radius 3 cm and an axle of radius 1 cm. What effort on the wheel lifts a 330 N bucket on the axle, in newtons? (ideal)
  2. 2.True or false: a movable pulley needs effort = load. (a) True (b) False
  3. 3.🪝 A bucket weighing 130 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  4. 4.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
  5. 5.🪝 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
  6. 6.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
  7. 7.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  8. 8.🪝 A winch has a wheel of radius 12 cm and an axle of radius 4 cm. What effort on the wheel lifts a 360 N bucket on the axle, in newtons? (ideal)
  9. 9.True or false: a movable pulley halves the effort. (a) False (b) True
  10. 10.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
  11. 11.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a smaller rod (axle) (c) a sharp wedge (d) a flat ramp
  12. 12.🪝 More rope sections holding a load means … (a) the load floats (b) more effort needed (c) no change (d) less effort needed
  13. 13.🪝 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?
  14. 14.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  15. 15.🪝 A winch has a wheel of radius 5 cm and an axle of radius 1 cm. What effort on the wheel lifts a 900 N bucket on the axle, in newtons? (ideal)
  16. 16.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
  17. 17.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
  18. 18.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
  19. 19.True or false: a movable pulley is on a flagpole top. (a) False (b) True
  20. 20.🪝 A well winch has a handle (wheel) of radius 7 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  21. 21.🪝 A bucket weighing 100 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  22. 22.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  23. 23.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
  24. 24.🪝 A pulley system lifts a 200 N load with an effort of 50 N. What is its mechanical advantage (MA)?
  25. 25.True or false: a movable pulley rises with the load. (a) True (b) False
  26. 26.🪝 A bucket weighing 320 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.True or false: a movable pulley stays in one place. (a) True (b) False
  28. 28.🪝 A load of 360 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  29. 29.🪝 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)
  30. 30.True or false: a movable pulley only changes direction. (a) False (b) True
  31. 31.🪝 A load of 160 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  32. 32.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
  33. 33.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
  34. 34.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
  35. 35.True or false: a fixed pulley rises with the load. (a) False (b) True
  36. 36.🪝 A pulley system lifts a 120 N load with an effort of 60 N. What is its mechanical advantage (MA)?
  37. 37.True or false: a fixed pulley only changes direction. (a) False (b) True
  38. 38.🪝 A winch has a wheel of radius 12 cm and an axle of radius 3 cm. What effort on the wheel lifts an 80 N bucket on the axle, in newtons? (ideal)
  39. 39.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
  40. 40.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True

Answer key

  1. 110
  2. False
  3. 130
  4. a movable pulley
  5. the direction of pull
  6. a movable pulley
  7. 4
  8. 120
  9. True
  10. True
  11. a smaller rod (axle)
  12. less effort needed
  13. 6
  14. a fixed pulley
  15. 180
  16. True
  17. 16
  18. False
  19. False
  20. 7
  21. 100
  22. 4
  23. True
  24. 4
  25. True
  26. 320
  27. False
  28. 180
  29. 300
  30. False
  31. 40
  32. a movable pulley
  33. 4
  34. 24
  35. False
  36. 2
  37. True
  38. 20
  39. 9
  40. False

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