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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 127 · 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 load of 220 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  2. 2.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
  3. 3.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
  4. 4.🪝 A load of 360 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 pulley system has 4 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
  6. 6.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
  7. 7.🪝 A winch has a wheel of radius 7 cm and an axle of radius 1 cm. What effort on the wheel lifts a 420 N bucket on the axle, in newtons? (ideal)
  8. 8.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
  9. 9.🪝 A bucket weighing 490 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  10. 10.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
  11. 11.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
  12. 12.True or false: a movable pulley needs effort = load. (a) False (b) True
  13. 13.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  14. 14.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
  15. 15.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
  16. 16.True or false: a fixed pulley needs effort = load. (a) False (b) True
  17. 17.🪝 A pulley system lifts a 240 N load with an effort of 60 N. What is its mechanical advantage (MA)?
  18. 18.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
  19. 19.🪝 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?
  20. 20.🪝 A load of 200 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  21. 21.🪝 A winch has a wheel of radius 6 cm and an axle of radius 1 cm. What effort on the wheel lifts a 180 N bucket on the axle, in newtons? (ideal)
  22. 22.🪝 A pulley system lifts a 580 N load with an effort of 290 N. What is its mechanical advantage (MA)?
  23. 23.🪝 More rope sections holding a load means … (a) the load floats (b) less effort needed (c) more effort needed (d) no change
  24. 24.🪝 A pulley system lifts a 360 N load with an effort of 120 N. What is its mechanical advantage (MA)?
  25. 25.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
  26. 26.🪝 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?
  27. 27.🪝 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)
  28. 28.🪝 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)
  29. 29.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
  30. 30.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a loose rope (c) a flat ramp (d) a smaller rod (axle)
  31. 31.🪝 What does a single fixed pulley change? (a) gravity (b) the colour of rope (c) the size of the load (d) the direction of pull
  32. 32.🪝 A winch has a wheel of radius 40 cm and an axle of radius 5 cm. What effort on the wheel lifts an 800 N bucket on the axle, in newtons? (ideal)
  33. 33.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  34. 34.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  35. 35.🪝 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?
  36. 36.True or false: a movable pulley stays in one place. (a) True (b) False
  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.🪝 A load of 80 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  39. 39.🪝 A pulley system lifts a 60 N load with an effort of 20 N. What is its mechanical advantage (MA)?
  40. 40.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley

Answer key

  1. 110
  2. False
  3. True
  4. 120
  5. 28
  6. a movable pulley
  7. 60
  8. a fixed pulley
  9. 490
  10. False
  11. 4
  12. False
  13. a fixed pulley
  14. a fixed pulley
  15. 2
  16. True
  17. 4
  18. 1
  19. 2
  20. 50
  21. 30
  22. 2
  23. less effort needed
  24. 3
  25. True
  26. 8
  27. 170
  28. 70
  29. 27
  30. a smaller rod (axle)
  31. the direction of pull
  32. 100
  33. 6
  34. 2
  35. 9
  36. False
  37. 6
  38. 40
  39. 3
  40. a fixed pulley

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