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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 79 · 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) the load floats (b) no change (c) more effort needed (d) less effort needed
  2. 2.🪝 A bucket weighing 70 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  3. 3.🪝 What does a single fixed pulley change? (a) the size of the load (b) the direction of pull (c) gravity (d) the colour of rope
  4. 4.True or false: a fixed pulley halves the effort. (a) True (b) False
  5. 5.🪝 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)
  6. 6.🪝 A winch has a wheel of radius 5 cm and an axle of radius 1 cm. What effort on the wheel lifts a 200 N bucket on the axle, in newtons? (ideal)
  7. 7.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
  8. 8.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
  9. 9.🪝 A well winch has a handle (wheel) of radius 7 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  10. 10.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  11. 11.🪝 A winch has a wheel of radius 2 cm and an axle of radius 1 cm. What effort on the wheel lifts a 340 N bucket on the axle, in newtons? (ideal)
  12. 12.🪝 A load of 240 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  13. 13.🪝 A well winch has a handle (wheel) of radius 3 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  14. 14.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  15. 15.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
  16. 16.True or false: a fixed pulley only changes direction. (a) True (b) False
  17. 17.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  18. 18.🪝 A winch has a wheel of radius 28 cm and an axle of radius 4 cm. What effort on the wheel lifts an 840 N bucket on the axle, in newtons? (ideal)
  19. 19.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
  20. 20.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  21. 21.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
  22. 22.🪝 A winch has a wheel of radius 14 cm and an axle of radius 2 cm. What effort on the wheel lifts a 700 N bucket on the axle, in newtons? (ideal)
  23. 23.True or false: a movable pulley stays in one place. (a) True (b) False
  24. 24.True or false: a fixed pulley rises with the load. (a) True (b) False
  25. 25.🪝 A bucket weighing 130 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 pulley system lifts a 560 N load with an effort of 280 N. What is its mechanical advantage (MA)?
  27. 27.🪝 A winch has a wheel of radius 6 cm and an axle of radius 1 cm. What effort on the wheel lifts a 780 N bucket on the axle, in newtons? (ideal)
  28. 28.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  29. 29.🪝 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?
  30. 30.🪝 A bucket weighing 240 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  31. 31.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  32. 32.True or false: a movable pulley rises with the load. (a) True (b) False
  33. 33.🪝 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)
  34. 34.🪝 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)
  35. 35.🪝 A bucket weighing 170 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.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
  37. 37.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
  38. 38.🪝 A pulley system lifts a 40 N load with an effort of 20 N. What is its mechanical advantage (MA)?
  39. 39.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a smaller rod (axle) (c) a flat ramp (d) a sharp wedge
  40. 40.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?

Answer key

  1. less effort needed
  2. 70
  3. the direction of pull
  4. False
  5. 50
  6. 40
  7. 4
  8. False
  9. 7
  10. 6
  11. 170
  12. 120
  13. 3
  14. a movable pulley
  15. a fixed pulley
  16. True
  17. 2
  18. 120
  19. a movable pulley
  20. a fixed pulley
  21. True
  22. 100
  23. False
  24. False
  25. 130
  26. 2
  27. 130
  28. a fixed pulley
  29. 16
  30. 240
  31. 8
  32. True
  33. 90
  34. 280
  35. 170
  36. True
  37. a movable pulley
  38. 2
  39. a smaller rod (axle)
  40. 3

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