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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 839 · 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 wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a sharp wedge (c) a flat ramp (d) a loose rope
  2. 2.🪝 A winch has a wheel of radius 15 cm and an axle of radius 3 cm. What effort on the wheel lifts a 750 N bucket on the axle, in newtons? (ideal)
  3. 3.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
  4. 4.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
  5. 5.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
  6. 6.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
  7. 7.🪝 A well winch has a handle (wheel) of radius 7 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  8. 8.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
  9. 9.🪝 A load of 90 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  10. 10.🪝 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?
  11. 11.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
  12. 12.True or false: a fixed pulley halves the effort. (a) False (b) True
  13. 13.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  14. 14.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
  15. 15.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
  16. 16.True or false: a fixed pulley stays in one place. (a) True (b) False
  17. 17.🪝 A load of 210 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  18. 18.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the direction of pull (c) the size of the load (d) gravity
  19. 19.🪝 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)
  20. 20.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  21. 21.🪝 A bucket weighing 350 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  22. 22.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 260 N bucket on the axle, in newtons? (ideal)
  23. 23.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  24. 24.🪝 A well winch has a handle (wheel) of radius 28 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  25. 25.🪝 More rope sections holding a load means … (a) more effort needed (b) less effort needed (c) no change (d) the load floats
  26. 26.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
  27. 27.🪝 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?
  28. 28.🪝 A winch has a wheel of radius 21 cm and an axle of radius 3 cm. What effort on the wheel lifts a 420 N bucket on the axle, in newtons? (ideal)
  29. 29.True or false: a movable pulley rises with the load. (a) False (b) True
  30. 30.🪝 A load of 540 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  31. 31.True or false: a fixed pulley needs effort = load. (a) False (b) True
  32. 32.🪝 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)
  33. 33.True or false: a movable pulley halves the effort. (a) False (b) True
  34. 34.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
  35. 35.🪝 A well winch has a handle (wheel) of radius 9 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  36. 36.🪝 A winch has a wheel of radius 30 cm and an axle of radius 5 cm. What effort on the wheel lifts a 1020 N bucket on the axle, in newtons? (ideal)
  37. 37.🪝 A bucket weighing 30 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  38. 38.🪝 A well winch has a handle (wheel) of radius 18 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  39. 39.🪝 A well winch has a handle (wheel) of radius 14 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  40. 40.True or false: a movable pulley only changes direction. (a) False (b) True

Answer key

  1. a smaller rod (axle)
  2. 150
  3. True
  4. False
  5. 32
  6. 6
  7. 7
  8. a fixed pulley
  9. 30
  10. 7
  11. False
  12. False
  13. a fixed pulley
  14. a movable pulley
  15. 4
  16. True
  17. 70
  18. the direction of pull
  19. 240
  20. 4
  21. 350
  22. 130
  23. a movable pulley
  24. 7
  25. less effort needed
  26. a fixed pulley
  27. 18
  28. 60
  29. True
  30. 180
  31. True
  32. 460
  33. True
  34. a movable pulley
  35. 3
  36. 170
  37. 30
  38. 6
  39. 7
  40. False

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