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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 76 · 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) the size of the load (b) the direction of pull (c) gravity (d) the colour of rope
  2. 2.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
  3. 3.🪝 A pulley system lifts an 870 N load with an effort of 290 N. What is its mechanical advantage (MA)?
  4. 4.True or false: a fixed pulley rises with the load. (a) False (b) True
  5. 5.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
  6. 6.🪝 A pulley system lifts a 480 N load with an effort of 160 N. What is its mechanical advantage (MA)?
  7. 7.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
  8. 8.🪝 A well winch has a handle (wheel) of radius 30 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  9. 9.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  10. 10.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  11. 11.🪝 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
  12. 12.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  13. 13.True or false: a movable pulley rises with the load. (a) True (b) False
  14. 14.True or false: a fixed pulley stays in one place. (a) True (b) False
  15. 15.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  16. 16.🪝 A winch has a wheel of radius 12 cm and an axle of radius 4 cm. What effort on the wheel lifts a 510 N bucket on the axle, in newtons? (ideal)
  17. 17.🪝 A load of 280 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  18. 18.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
  19. 19.🪝 More rope sections holding a load means … (a) more effort needed (b) no change (c) the load floats (d) less effort needed
  20. 20.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
  21. 21.🪝 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)
  22. 22.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
  23. 23.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
  24. 24.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  25. 25.🪝 A bucket weighing 140 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  26. 26.🪝 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?
  27. 27.🪝 A winch has a wheel of radius 24 cm and an axle of radius 3 cm. What effort on the wheel lifts a 1600 N bucket on the axle, in newtons? (ideal)
  28. 28.🪝 A pulley system lifts a 540 N load with an effort of 270 N. What is its mechanical advantage (MA)?
  29. 29.🪝 A load of 120 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  30. 30.🪝 A pulley system lifts a 60 N load with an effort of 20 N. What is its mechanical advantage (MA)?
  31. 31.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
  32. 32.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
  33. 33.🪝 A winch has a wheel of radius 6 cm and an axle of radius 3 cm. What effort on the wheel lifts a 380 N bucket on the axle, in newtons? (ideal)
  34. 34.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
  35. 35.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
  36. 36.🪝 A well winch has a handle (wheel) of radius 3 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  37. 37.🪝 A load of 240 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.True or false: a movable pulley needs effort = load. (a) True (b) False
  39. 39.🪝 A bucket weighing 400 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  40. 40.🪝 A winch has a wheel of radius 28 cm and an axle of radius 4 cm. What effort on the wheel lifts a 630 N bucket on the axle, in newtons? (ideal)

Answer key

  1. the direction of pull
  2. 8
  3. 3
  4. False
  5. a fixed pulley
  6. 3
  7. False
  8. 6
  9. 2
  10. a movable pulley
  11. a smaller rod (axle)
  12. 3
  13. True
  14. True
  15. a fixed pulley
  16. 170
  17. 140
  18. a fixed pulley
  19. less effort needed
  20. a fixed pulley
  21. 50
  22. 27
  23. a movable pulley
  24. 5
  25. 140
  26. 4
  27. 200
  28. 2
  29. 30
  30. 3
  31. 32
  32. 9
  33. 190
  34. True
  35. False
  36. 3
  37. 120
  38. False
  39. 400
  40. 90

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