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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 172 · 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 5 cm and an axle of radius 1 cm. What effort on the wheel lifts a 950 N bucket on the axle, in newtons? (ideal)
  2. 2.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
  3. 3.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
  4. 4.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
  5. 5.🪝 A winch has a wheel of radius 15 cm and an axle of radius 5 cm. What effort on the wheel lifts a 390 N bucket on the axle, in newtons? (ideal)
  6. 6.🪝 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)
  7. 7.🪝 A bucket weighing 60 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  8. 8.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a sharp wedge (c) a flat ramp (d) a smaller rod (axle)
  9. 9.🪝 A load of 720 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.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
  11. 11.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  12. 12.🪝 A well winch has a handle (wheel) of radius 9 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  13. 13.🪝 A pulley system lifts a 300 N load with an effort of 100 N. What is its mechanical advantage (MA)?
  14. 14.🪝 What does a single fixed pulley change? (a) the colour of rope (b) gravity (c) the size of the load (d) the direction of pull
  15. 15.🪝 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)
  16. 16.🪝 More rope sections holding a load means … (a) less effort needed (b) more effort needed (c) the load floats (d) no change
  17. 17.True or false: a movable pulley only changes direction. (a) False (b) True
  18. 18.🪝 A pulley system lifts a 640 N load with an effort of 160 N. What is its mechanical advantage (MA)?
  19. 19.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  20. 20.True or false: a fixed pulley stays in one place. (a) False (b) True
  21. 21.🪝 A bucket weighing 450 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 270 N load with an effort of 90 N. What is its mechanical advantage (MA)?
  23. 23.True or false: a fixed pulley needs effort = load. (a) True (b) False
  24. 24.🪝 A pulley system lifts a 180 N load with an effort of 60 N. What is its mechanical advantage (MA)?
  25. 25.🪝 A winch has a wheel of radius 6 cm and an axle of radius 2 cm. What effort on the wheel lifts a 390 N bucket on the axle, in newtons? (ideal)
  26. 26.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  27. 27.True or false: a movable pulley stays in one place. (a) True (b) False
  28. 28.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
  29. 29.🪝 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)
  30. 30.🪝 A winch has a wheel of radius 14 cm and an axle of radius 2 cm. What effort on the wheel lifts a 1190 N bucket on the axle, in newtons? (ideal)
  31. 31.True or false: a movable pulley is on a flagpole top. (a) False (b) True
  32. 32.True or false: a movable pulley rises with the load. (a) False (b) True
  33. 33.🪝 A load of 1120 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  34. 34.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
  35. 35.🪝 A load of 600 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  36. 36.🪝 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)
  37. 37.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  38. 38.True or false: a fixed pulley halves the effort. (a) True (b) False
  39. 39.🪝 A load of 560 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  40. 40.🪝 A winch has a wheel of radius 12 cm and an axle of radius 2 cm. What effort on the wheel lifts a 360 N bucket on the axle, in newtons? (ideal)

Answer key

  1. 190
  2. a movable pulley
  3. True
  4. a fixed pulley
  5. 130
  6. 120
  7. 60
  8. a smaller rod (axle)
  9. 240
  10. False
  11. a fixed pulley
  12. 3
  13. 3
  14. the direction of pull
  15. 70
  16. less effort needed
  17. False
  18. 4
  19. a fixed pulley
  20. True
  21. 450
  22. 3
  23. True
  24. 3
  25. 130
  26. 2
  27. False
  28. 12
  29. 20
  30. 170
  31. False
  32. True
  33. 280
  34. False
  35. 200
  36. 350
  37. 4
  38. False
  39. 280
  40. 60

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