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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 847 · 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 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)
  2. 2.🪝 More rope sections holding a load means … (a) no change (b) the load floats (c) more effort needed (d) less effort needed
  3. 3.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  4. 4.True or false: a movable pulley only changes direction. (a) True (b) False
  5. 5.🪝 A pulley system lifts an 800 N load with an effort of 200 N. What is its mechanical advantage (MA)?
  6. 6.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
  7. 7.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  8. 8.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
  9. 9.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a loose rope (c) a flat ramp (d) a sharp wedge
  10. 10.True or false: a fixed pulley halves the effort. (a) False (b) True
  11. 11.🪝 A well winch has a handle (wheel) of radius 7 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  12. 12.🪝 A winch has a wheel of radius 40 cm and an axle of radius 5 cm. What effort on the wheel lifts a 1360 N bucket on the axle, in newtons? (ideal)
  13. 13.🪝 A pulley system lifts a 920 N load with an effort of 230 N. What is its mechanical advantage (MA)?
  14. 14.🪝 A bucket weighing 340 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  15. 15.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
  16. 16.🪝 A pulley system lifts a 360 N load with an effort of 120 N. What is its mechanical advantage (MA)?
  17. 17.🪝 A pulley system lifts a 360 N load with an effort of 180 N. What is its mechanical advantage (MA)?
  18. 18.🪝 A load of 400 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  19. 19.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
  20. 20.🪝 A bucket weighing 370 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  21. 21.🪝 A load of 570 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 well winch has a handle (wheel) of radius 10 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  23. 23.🪝 A winch has a wheel of radius 24 cm and an axle of radius 4 cm. What effort on the wheel lifts a 540 N bucket on the axle, in newtons? (ideal)
  24. 24.True or false: a fixed pulley needs effort = load. (a) True (b) False
  25. 25.🪝 A well winch has a handle (wheel) of radius 9 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  26. 26.🪝 A bucket weighing 110 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.🪝 A pulley system lifts a 960 N load with an effort of 240 N. What is its mechanical advantage (MA)?
  28. 28.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the size of the load (c) the colour of rope (d) gravity
  29. 29.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
  30. 30.🪝 A pulley system lifts an 840 N load with an effort of 280 N. What is its mechanical advantage (MA)?
  31. 31.True or false: a movable pulley needs effort = load. (a) True (b) False
  32. 32.🪝 A pulley system lifts a 480 N load with an effort of 160 N. What is its mechanical advantage (MA)?
  33. 33.🪝 A winch has a wheel of radius 3 cm and an axle of radius 1 cm. What effort on the wheel lifts a 480 N bucket on the axle, in newtons? (ideal)
  34. 34.🪝 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)
  35. 35.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
  36. 36.True or false: a movable pulley rises with the load. (a) False (b) True
  37. 37.True or false: a fixed pulley rises with the load. (a) True (b) False
  38. 38.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
  39. 39.🪝 A well winch has a handle (wheel) of radius 25 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  40. 40.🪝 A pulley system lifts a 1000 N load with an effort of 250 N. What is its mechanical advantage (MA)?

Answer key

  1. 290
  2. less effort needed
  3. a fixed pulley
  4. False
  5. 4
  6. a movable pulley
  7. 5
  8. a fixed pulley
  9. a smaller rod (axle)
  10. False
  11. 7
  12. 170
  13. 4
  14. 340
  15. a movable pulley
  16. 3
  17. 2
  18. 200
  19. a movable pulley
  20. 370
  21. 190
  22. 5
  23. 90
  24. True
  25. 3
  26. 110
  27. 4
  28. the direction of pull
  29. a fixed pulley
  30. 3
  31. False
  32. 3
  33. 160
  34. 100
  35. False
  36. True
  37. False
  38. 1
  39. 5
  40. 4

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