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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 473 · 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 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)
  2. 2.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  3. 3.🪝 A load of 40 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  4. 4.🪝 What does a single fixed pulley change? (a) the size of the load (b) the direction of pull (c) the colour of rope (d) gravity
  5. 5.🪝 A bucket weighing 180 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  6. 6.🪝 A load of 200 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  7. 7.🪝 A well winch has a handle (wheel) of radius 21 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  8. 8.True or false: a movable pulley is on a flagpole top. (a) False (b) True
  9. 9.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  10. 10.🪝 A winch has a wheel of radius 24 cm and an axle of radius 3 cm. What effort on the wheel lifts a 480 N bucket on the axle, in newtons? (ideal)
  11. 11.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
  12. 12.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a loose rope (c) a smaller rod (axle) (d) a sharp wedge
  13. 13.🪝 A bucket weighing 360 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  14. 14.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  15. 15.🪝 A pulley system lifts a 720 N load with an effort of 240 N. What is its mechanical advantage (MA)?
  16. 16.True or false: a fixed pulley stays in one place. (a) False (b) True
  17. 17.🪝 A winch has a wheel of radius 8 cm and an axle of radius 4 cm. What effort on the wheel lifts a 360 N bucket on the axle, in newtons? (ideal)
  18. 18.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
  19. 19.🪝 A well winch has a handle (wheel) of radius 24 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  20. 20.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
  21. 21.True or false: a movable pulley stays in one place. (a) True (b) False
  22. 22.True or false: a movable pulley only changes direction. (a) True (b) False
  23. 23.🪝 A pulley system lifts a 1080 N load with an effort of 270 N. What is its mechanical advantage (MA)?
  24. 24.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  25. 25.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  26. 26.True or false: a fixed pulley rises with the load. (a) True (b) False
  27. 27.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
  28. 28.🪝 A load of 200 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  29. 29.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  30. 30.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
  31. 31.🪝 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?
  32. 32.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
  33. 33.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  34. 34.🪝 A pulley system lifts a 330 N load with an effort of 110 N. What is its mechanical advantage (MA)?
  35. 35.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
  36. 36.🪝 A bucket weighing 380 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  37. 37.True or false: a fixed pulley needs effort = load. (a) False (b) True
  38. 38.🪝 A winch has a wheel of radius 12 cm and an axle of radius 3 cm. What effort on the wheel lifts a 240 N bucket on the axle, in newtons? (ideal)
  39. 39.🪝 More rope sections holding a load means … (a) less effort needed (b) more effort needed (c) no change (d) the load floats
  40. 40.🪝 A pulley system lifts a 60 N load with an effort of 20 N. What is its mechanical advantage (MA)?

Answer key

  1. 90
  2. a fixed pulley
  3. 20
  4. the direction of pull
  5. 180
  6. 100
  7. 7
  8. False
  9. a fixed pulley
  10. 60
  11. a movable pulley
  12. a smaller rod (axle)
  13. 360
  14. 2
  15. 3
  16. True
  17. 180
  18. 2
  19. 6
  20. True
  21. False
  22. False
  23. 4
  24. a movable pulley
  25. 2
  26. False
  27. 6
  28. 50
  29. a movable pulley
  30. 18
  31. 1
  32. False
  33. a fixed pulley
  34. 3
  35. False
  36. 380
  37. True
  38. 60
  39. less effort needed
  40. 3

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