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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 780 · 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 lifts a 520 N load with an effort of 260 N. What is its mechanical advantage (MA)?
  2. 2.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
  3. 3.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
  4. 4.🪝 What does a single fixed pulley change? (a) gravity (b) the direction of pull (c) the colour of rope (d) the size of the load
  5. 5.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
  6. 6.🪝 A pulley system lifts a 260 N load with an effort of 130 N. What is its mechanical advantage (MA)?
  7. 7.🪝 A well winch has a handle (wheel) of radius 9 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  8. 8.True or false: a fixed pulley needs effort = load. (a) True (b) False
  9. 9.🪝 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?
  10. 10.True or false: a fixed pulley stays in one place. (a) True (b) False
  11. 11.True or false: a movable pulley is on a flagpole top. (a) True (b) False
  12. 12.🪝 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?
  13. 13.🪝 A bucket weighing 280 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.True or false: a fixed pulley rises with the load. (a) True (b) False
  15. 15.True or false: a fixed pulley only changes direction. (a) False (b) True
  16. 16.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  17. 17.🪝 A pulley system lifts a 460 N load with an effort of 230 N. What is its mechanical advantage (MA)?
  18. 18.True or false: a movable pulley stays in one place. (a) True (b) False
  19. 19.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  20. 20.🪝 A load of 270 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  21. 21.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  22. 22.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  23. 23.True or false: a movable pulley rises with the load. (a) True (b) False
  24. 24.🪝 A pulley system lifts a 280 N load with an effort of 140 N. What is its mechanical advantage (MA)?
  25. 25.🪝 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)
  26. 26.🪝 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?
  27. 27.🪝 A pulley system lifts a 360 N load with an effort of 90 N. What is its mechanical advantage (MA)?
  28. 28.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
  29. 29.True or false: a fixed pulley halves the effort. (a) True (b) False
  30. 30.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  31. 31.🪝 A pulley system lifts a 380 N load with an effort of 190 N. What is its mechanical advantage (MA)?
  32. 32.True or false: a movable pulley only changes direction. (a) True (b) False
  33. 33.🪝 A well winch has a handle (wheel) of radius 5 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  34. 34.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  35. 35.🪝 More rope sections holding a load means … (a) no change (b) the load floats (c) less effort needed (d) more effort needed
  36. 36.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
  37. 37.🪝 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?
  38. 38.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a smaller rod (axle) (c) a sharp wedge (d) a loose rope
  39. 39.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  40. 40.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley

Answer key

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

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