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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 258 · 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 9 cm and an axle of radius 3 cm. What effort on the wheel lifts a 60 N bucket on the axle, in newtons? (ideal)
  2. 2.True or false: a movable pulley rises with the load. (a) False (b) True
  3. 3.🪝 A bucket weighing 100 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  4. 4.🪝 A winch has a wheel of radius 24 cm and an axle of radius 3 cm. What effort on the wheel lifts a 960 N bucket on the axle, in newtons? (ideal)
  5. 5.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
  6. 6.🪝 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
  7. 7.🪝 A winch has a wheel of radius 35 cm and an axle of radius 5 cm. What effort on the wheel lifts a 1120 N bucket on the axle, in newtons? (ideal)
  8. 8.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  9. 9.🪝 A pulley system lifts a 120 N load with an effort of 60 N. What is its mechanical advantage (MA)?
  10. 10.🪝 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)
  11. 11.🪝 A bucket weighing 160 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  12. 12.True or false: a movable pulley only changes direction. (a) True (b) False
  13. 13.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  14. 14.🪝 A winch has a wheel of radius 16 cm and an axle of radius 4 cm. What effort on the wheel lifts a 680 N bucket on the axle, in newtons? (ideal)
  15. 15.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) no change (d) less effort needed
  16. 16.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts an 80 N bucket on the axle, in newtons? (ideal)
  17. 17.True or false: a fixed pulley stays in one place. (a) True (b) False
  18. 18.🪝 A well winch has a handle (wheel) of radius 14 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  19. 19.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
  20. 20.🪝 A winch has a wheel of radius 7 cm and an axle of radius 1 cm. What effort on the wheel lifts a 700 N bucket on the axle, in newtons? (ideal)
  21. 21.🪝 A winch has a wheel of radius 24 cm and an axle of radius 3 cm. What effort on the wheel lifts a 1440 N bucket on the axle, in newtons? (ideal)
  22. 22.True or false: a movable pulley is on a flagpole top. (a) False (b) True
  23. 23.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a loose rope (c) a smaller rod (axle) (d) a flat ramp
  24. 24.🪝 A well winch has a handle (wheel) of radius 9 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  25. 25.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
  26. 26.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  27. 27.🪝 A bucket weighing 370 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  28. 28.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  29. 29.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
  30. 30.True or false: a fixed pulley needs effort = load. (a) False (b) True
  31. 31.🪝 A pulley system lifts a 360 N load with an effort of 120 N. What is its mechanical advantage (MA)?
  32. 32.True or false: a fixed pulley halves the effort. (a) False (b) True
  33. 33.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  34. 34.🪝 A pulley system lifts a 160 N load with an effort of 40 N. What is its mechanical advantage (MA)?
  35. 35.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
  36. 36.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
  37. 37.True or false: a movable pulley stays in one place. (a) True (b) False
  38. 38.🪝 A pulley system lifts a 100 N load with an effort of 50 N. What is its mechanical advantage (MA)?
  39. 39.🪝 A winch has a wheel of radius 32 cm and an axle of radius 4 cm. What effort on the wheel lifts a 1200 N bucket on the axle, in newtons? (ideal)
  40. 40.🪝 A load of 400 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

Answer key

  1. 20
  2. True
  3. 100
  4. 120
  5. a movable pulley
  6. the direction of pull
  7. 160
  8. 8
  9. 2
  10. 280
  11. 160
  12. False
  13. a movable pulley
  14. 170
  15. less effort needed
  16. 40
  17. True
  18. 7
  19. 6
  20. 100
  21. 180
  22. False
  23. a smaller rod (axle)
  24. 3
  25. 20
  26. 6
  27. 370
  28. a fixed pulley
  29. a fixed pulley
  30. True
  31. 3
  32. False
  33. a fixed pulley
  34. 4
  35. a movable pulley
  36. True
  37. False
  38. 2
  39. 150
  40. 200

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