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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 456 · 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 7 cm and an axle of radius 1 cm. What effort on the wheel lifts a 210 N bucket on the axle, in newtons? (ideal)
  2. 2.True or false: a movable pulley is on a flagpole top. (a) True (b) False
  3. 3.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
  4. 4.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
  5. 5.🪝 A bucket weighing 40 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 wheel and axle is a big wheel fixed to … (a) a loose rope (b) a smaller rod (axle) (c) a sharp wedge (d) a flat ramp
  7. 7.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
  8. 8.🪝 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)
  9. 9.True or false: a movable pulley needs effort = load. (a) False (b) True
  10. 10.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  11. 11.🪝 A bucket weighing 300 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.🪝 More rope sections holding a load means … (a) the load floats (b) less effort needed (c) no change (d) more effort needed
  13. 13.🪝 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?
  14. 14.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  15. 15.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
  16. 16.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 340 N bucket on the axle, in newtons? (ideal)
  17. 17.🪝 What does a single fixed pulley change? (a) the direction of pull (b) gravity (c) the size of the load (d) the colour of rope
  18. 18.True or false: a fixed pulley needs effort = load. (a) True (b) False
  19. 19.🪝 A load of 320 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  20. 20.🪝 A load of 960 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.True or false: a movable pulley rises with the load. (a) True (b) False
  22. 22.True or false: a movable pulley halves the effort. (a) False (b) True
  23. 23.🪝 A bucket weighing 180 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 pulley system has 3 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
  25. 25.🪝 A pulley system lifts an 80 N load with an effort of 20 N. What is its mechanical advantage (MA)?
  26. 26.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
  27. 27.🪝 A winch has a wheel of radius 4 cm and an axle of radius 1 cm. What effort on the wheel lifts a 520 N bucket on the axle, in newtons? (ideal)
  28. 28.🪝 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?
  29. 29.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  30. 30.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 200 N bucket on the axle, in newtons? (ideal)
  31. 31.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
  32. 32.🪝 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)
  33. 33.🪝 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?
  34. 34.🪝 A pulley system lifts a 60 N load with an effort of 30 N. What is its mechanical advantage (MA)?
  35. 35.🪝 A winch has a wheel of radius 21 cm and an axle of radius 3 cm. What effort on the wheel lifts a 210 N bucket on the axle, in newtons? (ideal)
  36. 36.True or false: a fixed pulley stays in one place. (a) True (b) False
  37. 37.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
  38. 38.True or false: a fixed pulley only changes direction. (a) True (b) False
  39. 39.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
  40. 40.🪝 A load of 100 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. 30
  2. False
  3. a fixed pulley
  4. False
  5. 40
  6. a smaller rod (axle)
  7. a movable pulley
  8. 500
  9. False
  10. a fixed pulley
  11. 300
  12. less effort needed
  13. 8
  14. a fixed pulley
  15. 40
  16. 170
  17. the direction of pull
  18. True
  19. 160
  20. 240
  21. True
  22. True
  23. 180
  24. 21
  25. 4
  26. a movable pulley
  27. 130
  28. 7
  29. 3
  30. 100
  31. 12
  32. 100
  33. 6
  34. 2
  35. 30
  36. True
  37. False
  38. True
  39. a fixed pulley
  40. 50

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