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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 525 · 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.🪝 More rope sections holding a load means … (a) more effort needed (b) no change (c) the load floats (d) less effort needed
  2. 2.True or false: a movable pulley is on a flagpole top. (a) False (b) True
  3. 3.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
  4. 4.🪝 What does a single fixed pulley change? (a) gravity (b) the colour of rope (c) the direction of pull (d) the size of the load
  5. 5.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
  6. 6.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
  7. 7.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
  8. 8.🪝 A pulley system lifts a 1000 N load with an effort of 250 N. What is its mechanical advantage (MA)?
  9. 9.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  10. 10.🪝 A winch has a wheel of radius 3 cm and an axle of radius 1 cm. What effort on the wheel lifts a 360 N bucket on the axle, in newtons? (ideal)
  11. 11.🪝 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?
  12. 12.True or false: a fixed pulley needs effort = load. (a) False (b) True
  13. 13.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
  14. 14.🪝 A pulley system lifts a 90 N load with an effort of 30 N. What is its mechanical advantage (MA)?
  15. 15.🪝 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)
  16. 16.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
  17. 17.🪝 A bucket weighing 420 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 winch has a wheel of radius 6 cm and an axle of radius 3 cm. What effort on the wheel lifts an 80 N bucket on the axle, in newtons? (ideal)
  19. 19.True or false: a movable pulley only changes direction. (a) False (b) True
  20. 20.🪝 A winch has a wheel of radius 5 cm and an axle of radius 1 cm. What effort on the wheel lifts a 200 N bucket on the axle, in newtons? (ideal)
  21. 21.True or false: a movable pulley stays in one place. (a) False (b) True
  22. 22.🪝 A well winch has a handle (wheel) of radius 28 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  23. 23.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  24. 24.🪝 A well winch has a handle (wheel) of radius 32 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  25. 25.🪝 A pulley system lifts a 440 N load with an effort of 220 N. What is its mechanical advantage (MA)?
  26. 26.True or false: a fixed pulley only changes direction. (a) False (b) True
  27. 27.🪝 A well winch has a handle (wheel) of radius 7 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  28. 28.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
  29. 29.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  30. 30.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
  31. 31.True or false: a fixed pulley halves the effort. (a) True (b) False
  32. 32.🪝 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)
  33. 33.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  34. 34.🪝 A well winch has a handle (wheel) of radius 5 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  35. 35.🪝 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?
  36. 36.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
  37. 37.True or false: a movable pulley rises with the load. (a) False (b) True
  38. 38.🪝 A pulley system lifts a 680 N load with an effort of 170 N. What is its mechanical advantage (MA)?
  39. 39.🪝 A bucket weighing 280 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  40. 40.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley

Answer key

  1. less effort needed
  2. False
  3. a fixed pulley
  4. the direction of pull
  5. a movable pulley
  6. 9
  7. 2
  8. 4
  9. a fixed pulley
  10. 120
  11. 8
  12. True
  13. a movable pulley
  14. 3
  15. 410
  16. True
  17. 420
  18. 40
  19. False
  20. 40
  21. False
  22. 7
  23. 8
  24. 8
  25. 2
  26. True
  27. 7
  28. a fixed pulley
  29. a movable pulley
  30. False
  31. False
  32. 350
  33. a movable pulley
  34. 5
  35. 18
  36. False
  37. True
  38. 4
  39. 280
  40. a fixed pulley

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