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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 651 · 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) the load floats (c) less effort needed (d) no change
  2. 2.True or false: a fixed pulley only changes direction. (a) True (b) False
  3. 3.True or false: a fixed pulley needs effort = load. (a) True (b) False
  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 80 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.🪝 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?
  7. 7.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  8. 8.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
  9. 9.🪝 A well winch has a handle (wheel) of radius 28 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  10. 10.True or false: a movable pulley rises with the load. (a) False (b) True
  11. 11.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
  12. 12.🪝 A load of 340 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.True or false: a fixed pulley rises with the load. (a) True (b) False
  14. 14.🪝 A bucket weighing 110 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  15. 15.🪝 What does a single fixed pulley change? (a) the size of the load (b) the direction of pull (c) gravity (d) the colour of rope
  16. 16.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  17. 17.🪝 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)
  18. 18.True or false: a movable pulley only changes direction. (a) False (b) True
  19. 19.🪝 A pulley system lifts a 160 N load with an effort of 80 N. What is its mechanical advantage (MA)?
  20. 20.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
  21. 21.True or false: a movable pulley is on a flagpole top. (a) True (b) False
  22. 22.🪝 A load of 360 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  23. 23.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
  24. 24.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
  25. 25.🪝 A winch has a wheel of radius 21 cm and an axle of radius 3 cm. What effort on the wheel lifts a 1260 N bucket on the axle, in newtons? (ideal)
  26. 26.🪝 A winch has a wheel of radius 6 cm and an axle of radius 3 cm. What effort on the wheel lifts a 340 N bucket on the axle, in newtons? (ideal)
  27. 27.True or false: a movable pulley needs effort = load. (a) True (b) False
  28. 28.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
  29. 29.🪝 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)
  30. 30.True or false: a movable pulley stays in one place. (a) False (b) True
  31. 31.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 280 N bucket on the axle, in newtons? (ideal)
  32. 32.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  33. 33.True or false: a fixed pulley halves the effort. (a) False (b) True
  34. 34.🪝 A load of 810 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 pulley system lifts a 520 N load with an effort of 260 N. What is its mechanical advantage (MA)?
  36. 36.🪝 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)
  37. 37.🪝 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)
  38. 38.🪝 A load of 80 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  39. 39.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  40. 40.🪝 A pulley system lifts a 380 N load with an effort of 190 N. What is its mechanical advantage (MA)?

Answer key

  1. less effort needed
  2. True
  3. True
  4. a smaller rod (axle)
  5. 80
  6. 3
  7. a fixed pulley
  8. a movable pulley
  9. 7
  10. True
  11. 7
  12. 170
  13. False
  14. 110
  15. the direction of pull
  16. 8
  17. 70
  18. False
  19. 2
  20. False
  21. False
  22. 90
  23. True
  24. a fixed pulley
  25. 180
  26. 170
  27. False
  28. True
  29. 50
  30. False
  31. 140
  32. a fixed pulley
  33. False
  34. 270
  35. 2
  36. 420
  37. 370
  38. 20
  39. a movable pulley
  40. 2

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