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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 217 · 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) the load floats (c) no change (d) less effort needed
  2. 2.True or false: a movable pulley rises with the load. (a) True (b) False
  3. 3.🪝 A winch has a wheel of radius 4 cm and an axle of radius 1 cm. What effort on the wheel lifts a 720 N bucket on the axle, in newtons? (ideal)
  4. 4.🪝 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?
  5. 5.🪝 What does a single fixed pulley change? (a) gravity (b) the direction of pull (c) the colour of rope (d) the size of the load
  6. 6.🪝 A load of 870 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  7. 7.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
  8. 8.🪝 A pulley system lifts a 340 N load with an effort of 170 N. What is its mechanical advantage (MA)?
  9. 9.🪝 A winch has a wheel of radius 32 cm and an axle of radius 4 cm. What effort on the wheel lifts a 1280 N bucket on the axle, in newtons? (ideal)
  10. 10.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
  11. 11.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
  12. 12.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
  13. 13.🪝 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)
  14. 14.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  15. 15.🪝 A pulley system lifts a 120 N load with an effort of 60 N. What is its mechanical advantage (MA)?
  16. 16.True or false: a movable pulley only changes direction. (a) True (b) False
  17. 17.🪝 A bucket weighing 120 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  18. 18.🪝 A load of 1200 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  19. 19.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
  20. 20.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  21. 21.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
  22. 22.🪝 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?
  23. 23.🪝 A load of 840 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  24. 24.True or false: a fixed pulley only changes direction. (a) True (b) False
  25. 25.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
  26. 26.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  27. 27.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  28. 28.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
  29. 29.🪝 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?
  30. 30.🪝 A winch has a wheel of radius 21 cm and an axle of radius 3 cm. What effort on the wheel lifts a 700 N bucket on the axle, in newtons? (ideal)
  31. 31.🪝 A winch has a wheel of radius 24 cm and an axle of radius 4 cm. What effort on the wheel lifts a 120 N bucket on the axle, in newtons? (ideal)
  32. 32.🪝 A winch has a wheel of radius 18 cm and an axle of radius 3 cm. What effort on the wheel lifts a 300 N bucket on the axle, in newtons? (ideal)
  33. 33.🪝 A winch has a wheel of radius 21 cm and an axle of radius 3 cm. What effort on the wheel lifts a 1050 N bucket on the axle, in newtons? (ideal)
  34. 34.🪝 A pulley system lifts a 150 N load with an effort of 50 N. What is its mechanical advantage (MA)?
  35. 35.🪝 A pulley system lifts a 1000 N load with an effort of 250 N. What is its mechanical advantage (MA)?
  36. 36.True or false: a fixed pulley halves the effort. (a) True (b) False
  37. 37.🪝 A bucket weighing 310 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  38. 38.True or false: a movable pulley stays in one place. (a) False (b) True
  39. 39.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a sharp wedge (c) a loose rope (d) a flat ramp
  40. 40.🪝 A well winch has a handle (wheel) of radius 28 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?

Answer key

  1. less effort needed
  2. True
  3. 180
  4. 20
  5. the direction of pull
  6. 290
  7. True
  8. 2
  9. 160
  10. True
  11. a movable pulley
  12. 28
  13. 90
  14. a fixed pulley
  15. 2
  16. False
  17. 120
  18. 300
  19. a fixed pulley
  20. 2
  21. 4
  22. 4
  23. 210
  24. True
  25. 14
  26. a fixed pulley
  27. a movable pulley
  28. False
  29. 16
  30. 100
  31. 20
  32. 50
  33. 150
  34. 3
  35. 4
  36. False
  37. 310
  38. False
  39. a smaller rod (axle)
  40. 7

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