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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 228 · 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 pulley system has 3 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
  2. 2.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
  3. 3.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  4. 4.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
  5. 5.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  6. 6.🪝 A pulley system lifts a 1000 N load with an effort of 250 N. What is its mechanical advantage (MA)?
  7. 7.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the colour of rope (c) gravity (d) the size of the load
  8. 8.🪝 A load of 840 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  9. 9.🪝 More rope sections holding a load means … (a) no change (b) less effort needed (c) more effort needed (d) the load floats
  10. 10.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
  11. 11.True or false: a fixed pulley rises with the load. (a) False (b) True
  12. 12.🪝 A pulley system lifts a 570 N load with an effort of 190 N. What is its mechanical advantage (MA)?
  13. 13.🪝 A load of 920 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  14. 14.🪝 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)
  15. 15.🪝 A load of 1040 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  16. 16.🪝 A bucket weighing 20 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  17. 17.🪝 A bucket weighing 390 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 pulley system lifts an 80 N load with an effort of 40 N. What is its mechanical advantage (MA)?
  19. 19.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
  20. 20.True or false: a movable pulley only changes direction. (a) True (b) False
  21. 21.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
  22. 22.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
  23. 23.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a flat ramp (c) a loose rope (d) a smaller rod (axle)
  24. 24.True or false: a movable pulley halves the effort. (a) False (b) True
  25. 25.🪝 A bucket weighing 480 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 load of 880 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  27. 27.True or false: a fixed pulley needs effort = load. (a) False (b) True
  28. 28.🪝 A pulley system lifts a 380 N load with an effort of 190 N. What is its mechanical advantage (MA)?
  29. 29.🪝 A winch has a wheel of radius 4 cm and an axle of radius 1 cm. What effort on the wheel lifts a 120 N bucket on the axle, in newtons? (ideal)
  30. 30.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  31. 31.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  32. 32.🪝 A well winch has a handle (wheel) of radius 9 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  33. 33.True or false: a fixed pulley stays in one place. (a) True (b) False
  34. 34.True or false: a fixed pulley only changes direction. (a) True (b) False
  35. 35.🪝 A winch has a wheel of radius 40 cm and an axle of radius 5 cm. What effort on the wheel lifts an 800 N bucket on the axle, in newtons? (ideal)
  36. 36.🪝 A well winch has a handle (wheel) of radius 30 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  37. 37.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
  38. 38.🪝 A bucket weighing 50 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  39. 39.True or false: a movable pulley needs effort = load. (a) True (b) False
  40. 40.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 7 m, how many metres of rope must you pull?

Answer key

  1. 3
  2. a fixed pulley
  3. a movable pulley
  4. a fixed pulley
  5. a fixed pulley
  6. 4
  7. the direction of pull
  8. 280
  9. less effort needed
  10. a movable pulley
  11. False
  12. 3
  13. 230
  14. 320
  15. 260
  16. 20
  17. 390
  18. 2
  19. a movable pulley
  20. False
  21. True
  22. 16
  23. a smaller rod (axle)
  24. True
  25. 480
  26. 220
  27. True
  28. 2
  29. 30
  30. 4
  31. 3
  32. 3
  33. True
  34. True
  35. 100
  36. 6
  37. 40
  38. 50
  39. False
  40. 7

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