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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 987 · 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 bucket weighing 240 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  2. 2.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
  3. 3.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
  4. 4.True or false: a fixed pulley needs effort = load. (a) True (b) False
  5. 5.True or false: a movable pulley stays in one place. (a) True (b) False
  6. 6.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  7. 7.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) more effort needed (d) the load floats
  8. 8.🪝 A pulley system lifts a 760 N load with an effort of 190 N. What is its mechanical advantage (MA)?
  9. 9.🪝 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)
  10. 10.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
  11. 11.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
  12. 12.🪝 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)
  13. 13.🪝 A load of 680 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  14. 14.True or false: a fixed pulley stays in one place. (a) False (b) True
  15. 15.True or false: a movable pulley only changes direction. (a) False (b) True
  16. 16.True or false: a fixed pulley rises with the load. (a) False (b) True
  17. 17.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  18. 18.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
  19. 19.🪝 A bucket weighing 150 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.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
  21. 21.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
  22. 22.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a sharp wedge (c) a flat ramp (d) a loose rope
  23. 23.🪝 A winch has a wheel of radius 2 cm and an axle of radius 1 cm. What effort on the wheel lifts an 80 N bucket on the axle, in newtons? (ideal)
  24. 24.🪝 A bucket weighing 20 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 7 cm and an axle of radius 1 cm. What effort on the wheel lifts a 770 N bucket on the axle, in newtons? (ideal)
  26. 26.🪝 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?
  27. 27.🪝 A well winch has a handle (wheel) of radius 35 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  28. 28.True or false: a movable pulley needs effort = load. (a) False (b) True
  29. 29.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 160 N bucket on the axle, in newtons? (ideal)
  30. 30.🪝 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)
  31. 31.🪝 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?
  32. 32.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  33. 33.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  34. 34.🪝 What does a single fixed pulley change? (a) gravity (b) the direction of pull (c) the colour of rope (d) the size of the load
  35. 35.🪝 A load of 380 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  36. 36.True or false: a movable pulley halves the effort. (a) True (b) False
  37. 37.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
  38. 38.🪝 A pulley system lifts a 220 N load with an effort of 110 N. What is its mechanical advantage (MA)?
  39. 39.🪝 A bucket weighing 380 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 needs effort = load? (a) a fixed pulley (b) a movable pulley

Answer key

  1. 240
  2. False
  3. a movable pulley
  4. True
  5. False
  6. 4
  7. less effort needed
  8. 4
  9. 80
  10. True
  11. a movable pulley
  12. 300
  13. 170
  14. True
  15. False
  16. False
  17. 5
  18. 3
  19. 150
  20. a movable pulley
  21. a fixed pulley
  22. a smaller rod (axle)
  23. 40
  24. 20
  25. 110
  26. 4
  27. 7
  28. False
  29. 80
  30. 170
  31. 1
  32. a fixed pulley
  33. 3
  34. the direction of pull
  35. 190
  36. True
  37. False
  38. 2
  39. 380
  40. a fixed pulley

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