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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 320 · 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 winch has a wheel of radius 35 cm and an axle of radius 5 cm. What effort on the wheel lifts a 350 N bucket on the axle, in newtons? (ideal)
  2. 2.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  3. 3.🪝 A pulley system lifts a 570 N load with an effort of 190 N. What is its mechanical advantage (MA)?
  4. 4.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  5. 5.True or false: a movable pulley needs effort = load. (a) False (b) True
  6. 6.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
  7. 7.🪝 More rope sections holding a load means … (a) more effort needed (b) less effort needed (c) the load floats (d) no change
  8. 8.🪝 What does a single fixed pulley change? (a) gravity (b) the size of the load (c) the colour of rope (d) the direction of pull
  9. 9.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  10. 10.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
  11. 11.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  12. 12.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
  13. 13.🪝 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?
  14. 14.True or false: a fixed pulley only changes direction. (a) True (b) False
  15. 15.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
  16. 16.🪝 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)
  17. 17.🪝 A bucket weighing 190 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 has 2 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
  19. 19.🪝 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
  20. 20.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
  21. 21.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 260 N bucket on the axle, in newtons? (ideal)
  22. 22.🪝 A load of 500 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  23. 23.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  24. 24.🪝 A load of 580 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  25. 25.🪝 A winch has a wheel of radius 14 cm and an axle of radius 2 cm. What effort on the wheel lifts a 1050 N bucket on the axle, in newtons? (ideal)
  26. 26.True or false: a fixed pulley rises with the load. (a) True (b) False
  27. 27.True or false: a movable pulley stays in one place. (a) True (b) False
  28. 28.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
  29. 29.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
  30. 30.🪝 A well winch has a handle (wheel) of radius 7 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  31. 31.🪝 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)
  32. 32.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
  33. 33.🪝 A well winch has a handle (wheel) of radius 14 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  34. 34.🪝 A load of 340 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  35. 35.🪝 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)
  36. 36.🪝 A bucket weighing 100 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.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
  38. 38.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
  39. 39.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  40. 40.🪝 A pulley system lifts a 600 N load with an effort of 150 N. What is its mechanical advantage (MA)?

Answer key

  1. 50
  2. a fixed pulley
  3. 3
  4. 4
  5. False
  6. a fixed pulley
  7. less effort needed
  8. the direction of pull
  9. a movable pulley
  10. False
  11. 5
  12. a fixed pulley
  13. 15
  14. True
  15. a movable pulley
  16. 270
  17. 190
  18. 16
  19. a smaller rod (axle)
  20. True
  21. 130
  22. 250
  23. 2
  24. 290
  25. 150
  26. False
  27. False
  28. True
  29. 12
  30. 7
  31. 20
  32. 3
  33. 7
  34. 170
  35. 420
  36. 100
  37. 16
  38. 10
  39. 6
  40. 4

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