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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 982 · 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) no change (b) less effort needed (c) more effort needed (d) the load floats
  2. 2.🪝 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
  3. 3.🪝 A winch has a wheel of radius 8 cm and an axle of radius 4 cm. What effort on the wheel lifts a 60 N bucket on the axle, in newtons? (ideal)
  4. 4.🪝 A pulley system lifts a 160 N load with an effort of 40 N. What is its mechanical advantage (MA)?
  5. 5.🪝 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
  6. 6.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
  7. 7.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
  8. 8.🪝 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?
  9. 9.True or false: a fixed pulley needs effort = load. (a) False (b) True
  10. 10.🪝 A pulley system lifts a 540 N load with an effort of 180 N. What is its mechanical advantage (MA)?
  11. 11.True or false: a movable pulley is on a flagpole top. (a) False (b) True
  12. 12.True or false: a movable pulley stays in one place. (a) True (b) False
  13. 13.True or false: a movable pulley rises with the load. (a) False (b) True
  14. 14.🪝 A bucket weighing 420 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 bucket weighing 460 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  16. 16.True or false: a movable pulley halves the effort. (a) False (b) True
  17. 17.True or false: a movable pulley only changes direction. (a) False (b) True
  18. 18.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
  19. 19.🪝 A well winch has a handle (wheel) of radius 3 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  20. 20.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  21. 21.🪝 A well winch has a handle (wheel) of radius 7 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  22. 22.🪝 A winch has a wheel of radius 8 cm and an axle of radius 1 cm. What effort on the wheel lifts a 1520 N bucket on the axle, in newtons? (ideal)
  23. 23.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
  24. 24.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
  25. 25.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  26. 26.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
  27. 27.🪝 A pulley system lifts a 920 N load with an effort of 230 N. What is its mechanical advantage (MA)?
  28. 28.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
  29. 29.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
  30. 30.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
  31. 31.🪝 A winch has a wheel of radius 3 cm and an axle of radius 1 cm. What effort on the wheel lifts a 390 N bucket on the axle, in newtons? (ideal)
  32. 32.🪝 A winch has a wheel of radius 8 cm and an axle of radius 2 cm. What effort on the wheel lifts a 760 N bucket on the axle, in newtons? (ideal)
  33. 33.🪝 A bucket weighing 270 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  34. 34.🪝 A pulley system lifts a 40 N load with an effort of 20 N. What is its mechanical advantage (MA)?
  35. 35.🪝 A well winch has a handle (wheel) of radius 24 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  36. 36.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
  37. 37.🪝 A load of 140 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.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  39. 39.True or false: a fixed pulley halves the effort. (a) False (b) True
  40. 40.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?

Answer key

  1. less effort needed
  2. the direction of pull
  3. 30
  4. 4
  5. a smaller rod (axle)
  6. 24
  7. False
  8. 20
  9. True
  10. 3
  11. False
  12. False
  13. True
  14. 420
  15. 460
  16. True
  17. False
  18. a movable pulley
  19. 3
  20. a movable pulley
  21. 7
  22. 190
  23. a fixed pulley
  24. True
  25. 8
  26. True
  27. 4
  28. a fixed pulley
  29. 12
  30. 8
  31. 130
  32. 190
  33. 270
  34. 2
  35. 8
  36. a movable pulley
  37. 70
  38. 5
  39. False
  40. 2

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