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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 992 · 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 flat ramp (b) a loose rope (c) a smaller rod (axle) (d) a sharp wedge
  2. 2.🪝 More rope sections holding a load means … (a) less effort needed (b) more effort needed (c) no change (d) the load floats
  3. 3.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
  4. 4.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  5. 5.🪝 A load of 1040 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  6. 6.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
  7. 7.True or false: a fixed pulley halves the effort. (a) False (b) True
  8. 8.🪝 What does a single fixed pulley change? (a) gravity (b) the direction of pull (c) the size of the load (d) the colour of rope
  9. 9.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
  10. 10.🪝 A pulley system lifts a 270 N load with an effort of 90 N. What is its mechanical advantage (MA)?
  11. 11.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
  12. 12.🪝 A bucket weighing 450 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 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?
  14. 14.🪝 A winch has a wheel of radius 24 cm and an axle of radius 3 cm. What effort on the wheel lifts a 1200 N bucket on the axle, in newtons? (ideal)
  15. 15.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
  16. 16.True or false: a fixed pulley only changes direction. (a) True (b) False
  17. 17.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
  18. 18.🪝 A load of 280 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  19. 19.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
  20. 20.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
  21. 21.🪝 A bucket weighing 440 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  22. 22.🪝 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?
  23. 23.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
  24. 24.🪝 A load of 460 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  25. 25.🪝 A winch has a wheel of radius 24 cm and an axle of radius 4 cm. What effort on the wheel lifts a 1140 N bucket on the axle, in newtons? (ideal)
  26. 26.🪝 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)
  27. 27.True or false: a movable pulley needs effort = load. (a) False (b) True
  28. 28.🪝 A winch has a wheel of radius 12 cm and an axle of radius 2 cm. What effort on the wheel lifts a 960 N bucket on the axle, in newtons? (ideal)
  29. 29.🪝 A pulley system lifts a 480 N load with an effort of 240 N. What is its mechanical advantage (MA)?
  30. 30.🪝 A load of 880 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  31. 31.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
  32. 32.True or false: a movable pulley stays in one place. (a) True (b) False
  33. 33.True or false: a fixed pulley stays in one place. (a) False (b) True
  34. 34.True or false: a movable pulley only changes direction. (a) False (b) True
  35. 35.🪝 A well winch has a handle (wheel) of radius 9 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  36. 36.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
  37. 37.True or false: a movable pulley is on a flagpole top. (a) False (b) True
  38. 38.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
  39. 39.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  40. 40.🪝 A load of 120 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

Answer key

  1. a smaller rod (axle)
  2. less effort needed
  3. a fixed pulley
  4. a fixed pulley
  5. 260
  6. a movable pulley
  7. False
  8. the direction of pull
  9. False
  10. 3
  11. False
  12. 450
  13. 1
  14. 150
  15. a movable pulley
  16. True
  17. 12
  18. 70
  19. a movable pulley
  20. True
  21. 440
  22. 21
  23. a fixed pulley
  24. 230
  25. 190
  26. 230
  27. False
  28. 160
  29. 2
  30. 220
  31. 24
  32. False
  33. True
  34. False
  35. 3
  36. True
  37. False
  38. 9
  39. 5
  40. 30

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