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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 448 · 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 wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a flat ramp (c) a loose rope (d) a smaller rod (axle)
  2. 2.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
  3. 3.🪝 A load of 270 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  4. 4.True or false: a movable pulley needs effort = load. (a) True (b) False
  5. 5.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 160 N bucket on the axle, in newtons? (ideal)
  6. 6.True or false: a fixed pulley stays in one place. (a) True (b) False
  7. 7.🪝 A winch has a wheel of radius 8 cm and an axle of radius 2 cm. What effort on the wheel lifts a 440 N bucket on the axle, in newtons? (ideal)
  8. 8.True or false: a movable pulley stays in one place. (a) True (b) False
  9. 9.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
  10. 10.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
  11. 11.🪝 A winch has a wheel of radius 10 cm and an axle of radius 2 cm. What effort on the wheel lifts a 450 N bucket on the axle, in newtons? (ideal)
  12. 12.🪝 What does a single fixed pulley change? (a) the size of the load (b) the colour of rope (c) the direction of pull (d) gravity
  13. 13.🪝 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)
  14. 14.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  15. 15.🪝 More rope sections holding a load means … (a) no change (b) less effort needed (c) more effort needed (d) the load floats
  16. 16.🪝 A pulley system lifts a 140 N load with an effort of 70 N. What is its mechanical advantage (MA)?
  17. 17.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  18. 18.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
  19. 19.🪝 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)
  20. 20.🪝 A pulley system lifts a 450 N load with an effort of 150 N. What is its mechanical advantage (MA)?
  21. 21.🪝 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)
  22. 22.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
  23. 23.🪝 A winch has a wheel of radius 7 cm and an axle of radius 1 cm. What effort on the wheel lifts a 1190 N bucket on the axle, in newtons? (ideal)
  24. 24.🪝 A bucket weighing 200 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  25. 25.🪝 A winch has a wheel of radius 8 cm and an axle of radius 4 cm. What effort on the wheel lifts a 100 N bucket on the axle, in newtons? (ideal)
  26. 26.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  27. 27.True or false: a movable pulley rises with the load. (a) False (b) True
  28. 28.🪝 A bucket weighing 220 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 4 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
  30. 30.🪝 A bucket weighing 230 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  31. 31.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
  32. 32.True or false: a fixed pulley rises with the load. (a) False (b) True
  33. 33.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
  34. 34.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  35. 35.🪝 A pulley system lifts a 180 N load with an effort of 90 N. What is its mechanical advantage (MA)?
  36. 36.🪝 A winch has a wheel of radius 16 cm and an axle of radius 2 cm. What effort on the wheel lifts a 400 N bucket on the axle, in newtons? (ideal)
  37. 37.True or false: a fixed pulley only changes direction. (a) True (b) False
  38. 38.🪝 A winch has a wheel of radius 28 cm and an axle of radius 4 cm. What effort on the wheel lifts a 210 N bucket on the axle, in newtons? (ideal)
  39. 39.🪝 A pulley system lifts a 580 N load with an effort of 290 N. What is its mechanical advantage (MA)?
  40. 40.🪝 A winch has a wheel of radius 16 cm and an axle of radius 4 cm. What effort on the wheel lifts a 760 N bucket on the axle, in newtons? (ideal)

Answer key

  1. a smaller rod (axle)
  2. a movable pulley
  3. 90
  4. False
  5. 80
  6. True
  7. 110
  8. False
  9. a fixed pulley
  10. a movable pulley
  11. 90
  12. the direction of pull
  13. 40
  14. a fixed pulley
  15. less effort needed
  16. 2
  17. a fixed pulley
  18. a movable pulley
  19. 300
  20. 3
  21. 50
  22. True
  23. 170
  24. 200
  25. 50
  26. a movable pulley
  27. True
  28. 220
  29. 4
  30. 230
  31. True
  32. False
  33. True
  34. 4
  35. 2
  36. 50
  37. True
  38. 30
  39. 2
  40. 190

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