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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 41 · 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.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  2. 2.🪝 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)
  3. 3.🪝 A winch has a wheel of radius 20 cm and an axle of radius 5 cm. What effort on the wheel lifts a 160 N bucket on the axle, in newtons? (ideal)
  4. 4.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a sharp wedge (c) a loose rope (d) a flat ramp
  5. 5.🪝 A bucket weighing 120 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.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the size of the load (c) gravity (d) the colour of rope
  7. 7.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
  8. 8.🪝 A load of 150 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  9. 9.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
  10. 10.🪝 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?
  11. 11.🪝 A well winch has a handle (wheel) of radius 24 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  12. 12.🪝 A load of 380 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 pulley system lifts a 160 N load with an effort of 80 N. What is its mechanical advantage (MA)?
  14. 14.True or false: a movable pulley halves the effort. (a) False (b) True
  15. 15.🪝 More rope sections holding a load means … (a) more effort needed (b) less effort needed (c) the load floats (d) no change
  16. 16.🪝 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?
  17. 17.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
  18. 18.🪝 A load of 120 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  19. 19.🪝 A winch has a wheel of radius 35 cm and an axle of radius 5 cm. What effort on the wheel lifts a 420 N bucket on the axle, in newtons? (ideal)
  20. 20.🪝 A pulley system lifts a 120 N load with an effort of 30 N. What is its mechanical advantage (MA)?
  21. 21.🪝 A bucket weighing 230 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 pulley system lifts a 200 N load with an effort of 100 N. What is its mechanical advantage (MA)?
  23. 23.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  24. 24.🪝 A winch has a wheel of radius 25 cm and an axle of radius 5 cm. What effort on the wheel lifts an 850 N bucket on the axle, in newtons? (ideal)
  25. 25.🪝 A winch has a wheel of radius 6 cm and an axle of radius 1 cm. What effort on the wheel lifts a 900 N bucket on the axle, in newtons? (ideal)
  26. 26.True or false: a fixed pulley halves the effort. (a) True (b) False
  27. 27.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  28. 28.True or false: a fixed pulley needs effort = load. (a) False (b) True
  29. 29.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  30. 30.🪝 A pulley system lifts a 400 N load with an effort of 100 N. What is its mechanical advantage (MA)?
  31. 31.🪝 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)
  32. 32.🪝 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)
  33. 33.🪝 A winch has a wheel of radius 8 cm and an axle of radius 1 cm. What effort on the wheel lifts a 1440 N bucket on the axle, in newtons? (ideal)
  34. 34.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
  35. 35.True or false: a fixed pulley only changes direction. (a) True (b) False
  36. 36.🪝 A winch has a wheel of radius 32 cm and an axle of radius 4 cm. What effort on the wheel lifts an 880 N bucket on the axle, in newtons? (ideal)
  37. 37.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
  38. 38.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
  39. 39.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  40. 40.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False

Answer key

  1. a fixed pulley
  2. 50
  3. 40
  4. a smaller rod (axle)
  5. 120
  6. the direction of pull
  7. a movable pulley
  8. 50
  9. a movable pulley
  10. 4
  11. 6
  12. 190
  13. 2
  14. True
  15. less effort needed
  16. 8
  17. 24
  18. 30
  19. 60
  20. 4
  21. 230
  22. 2
  23. a fixed pulley
  24. 170
  25. 150
  26. False
  27. 4
  28. True
  29. 4
  30. 4
  31. 20
  32. 240
  33. 180
  34. 5
  35. True
  36. 110
  37. False
  38. True
  39. a fixed pulley
  40. False

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