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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 863 · 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.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
  2. 2.🪝 More rope sections holding a load means … (a) the load floats (b) more effort needed (c) less effort needed (d) no change
  3. 3.🪝 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?
  4. 4.🪝 A load of 870 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  5. 5.🪝 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)
  6. 6.🪝 A well winch has a handle (wheel) of radius 35 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  7. 7.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
  8. 8.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  9. 9.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
  10. 10.🪝 A bucket weighing 330 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  11. 11.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  12. 12.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  13. 13.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
  14. 14.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
  15. 15.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
  16. 16.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  17. 17.🪝 A bucket weighing 500 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  18. 18.🪝 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)
  19. 19.🪝 A bucket weighing 90 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.True or false: a fixed pulley halves the effort. (a) True (b) False
  21. 21.🪝 A winch has a wheel of radius 15 cm and an axle of radius 5 cm. What effort on the wheel lifts a 60 N bucket on the axle, in newtons? (ideal)
  22. 22.True or false: a movable pulley only changes direction. (a) False (b) True
  23. 23.🪝 A bucket weighing 170 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  24. 24.🪝 A winch has a wheel of radius 12 cm and an axle of radius 3 cm. What effort on the wheel lifts a 320 N bucket on the axle, in newtons? (ideal)
  25. 25.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the colour of rope (d) the direction of pull
  26. 26.🪝 A pulley system lifts a 560 N load with an effort of 280 N. What is its mechanical advantage (MA)?
  27. 27.🪝 A pulley system lifts a 440 N load with an effort of 220 N. What is its mechanical advantage (MA)?
  28. 28.True or false: a fixed pulley needs effort = load. (a) False (b) True
  29. 29.🪝 A load of 200 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  30. 30.True or false: a fixed pulley stays in one place. (a) False (b) True
  31. 31.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  32. 32.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
  33. 33.🪝 A bucket weighing 380 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  34. 34.🪝 A load of 300 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  35. 35.🪝 A bucket weighing 410 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  36. 36.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
  37. 37.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  38. 38.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
  39. 39.🪝 A pulley system lifts an 840 N load with an effort of 210 N. What is its mechanical advantage (MA)?
  40. 40.True or false: a movable pulley needs effort = load. (a) False (b) True

Answer key

  1. False
  2. less effort needed
  3. 8
  4. 290
  5. a smaller rod (axle)
  6. 7
  7. a movable pulley
  8. a fixed pulley
  9. 3
  10. 330
  11. 8
  12. a fixed pulley
  13. a movable pulley
  14. a movable pulley
  15. a fixed pulley
  16. 4
  17. 500
  18. 60
  19. 90
  20. False
  21. 20
  22. False
  23. 170
  24. 80
  25. the direction of pull
  26. 2
  27. 2
  28. True
  29. 100
  30. True
  31. 5
  32. 12
  33. 380
  34. 100
  35. 410
  36. a fixed pulley
  37. 6
  38. False
  39. 4
  40. False

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