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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 858 · 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 well winch has a handle (wheel) of radius 16 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  2. 2.🪝 A load of 1000 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  3. 3.🪝 A pulley system lifts a 100 N load with an effort of 50 N. What is its mechanical advantage (MA)?
  4. 4.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  5. 5.True or false: a movable pulley halves the effort. (a) True (b) False
  6. 6.🪝 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?
  7. 7.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
  8. 8.🪝 A winch has a wheel of radius 25 cm and an axle of radius 5 cm. What effort on the wheel lifts a 500 N bucket on the axle, in newtons? (ideal)
  9. 9.🪝 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?
  10. 10.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
  11. 11.True or false: a fixed pulley rises with the load. (a) False (b) True
  12. 12.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  13. 13.🪝 A winch has a wheel of radius 40 cm and an axle of radius 5 cm. What effort on the wheel lifts a 640 N bucket on the axle, in newtons? (ideal)
  14. 14.True or false: a movable pulley stays in one place. (a) False (b) True
  15. 15.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
  16. 16.🪝 A load of 800 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  17. 17.True or false: a fixed pulley needs effort = load. (a) True (b) False
  18. 18.🪝 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)
  19. 19.True or false: a fixed pulley halves the effort. (a) True (b) False
  20. 20.🪝 More rope sections holding a load means … (a) the load floats (b) less effort needed (c) more effort needed (d) no change
  21. 21.🪝 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)
  22. 22.🪝 A winch has a wheel of radius 21 cm and an axle of radius 3 cm. What effort on the wheel lifts a 980 N bucket on the axle, in newtons? (ideal)
  23. 23.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a smaller rod (axle) (c) a loose rope (d) a flat ramp
  24. 24.🪝 A pulley system lifts a 90 N load with an effort of 30 N. What is its mechanical advantage (MA)?
  25. 25.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the size of the load (c) gravity (d) the colour of rope
  26. 26.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
  27. 27.🪝 A bucket weighing 230 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  28. 28.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  29. 29.True or false: a movable pulley needs effort = load. (a) False (b) True
  30. 30.🪝 A pulley system lifts a 140 N load with an effort of 70 N. What is its mechanical advantage (MA)?
  31. 31.🪝 A pulley system lifts a 300 N load with an effort of 100 N. What is its mechanical advantage (MA)?
  32. 32.🪝 A winch has a wheel of radius 16 cm and an axle of radius 4 cm. What effort on the wheel lifts an 80 N bucket on the axle, in newtons? (ideal)
  33. 33.🪝 A pulley system lifts a 360 N load with an effort of 120 N. What is its mechanical advantage (MA)?
  34. 34.🪝 A pulley system lifts a 540 N load with an effort of 180 N. What is its mechanical advantage (MA)?
  35. 35.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
  36. 36.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  37. 37.True or false: a fixed pulley stays in one place. (a) True (b) False
  38. 38.🪝 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?
  39. 39.🪝 A pulley system lifts a 360 N load with an effort of 90 N. What is its mechanical advantage (MA)?
  40. 40.🪝 A load of 900 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. 4
  2. 250
  3. 2
  4. a fixed pulley
  5. True
  6. 28
  7. True
  8. 100
  9. 32
  10. False
  11. False
  12. 3
  13. 80
  14. False
  15. a movable pulley
  16. 200
  17. True
  18. 90
  19. False
  20. less effort needed
  21. 170
  22. 140
  23. a smaller rod (axle)
  24. 3
  25. the direction of pull
  26. 15
  27. 230
  28. a fixed pulley
  29. False
  30. 2
  31. 3
  32. 20
  33. 3
  34. 3
  35. a fixed pulley
  36. 5
  37. True
  38. 6
  39. 4
  40. 300

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