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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 767 · 40 questions
TalentJR

Engineer's tip (Less force, more distance): MA = load ÷ effort. Work (J) = force (N) × distance (m); force = work ÷ distance; distance = work ÷ force. Ideal ramp: MA = length ÷ height, effort = load ÷ MA.

NameDateTime takenScore ___ / 40
  1. 1.🏋️ Pushing a crate 3 m took 810 J of work. What force was used, in newtons?
  2. 2.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, always (c) yes, by half (d) only on Mondays
  3. 3.🏋️ A force of 160 N did 1280 J of work. How many metres did the object move?
  4. 4.🏋️ A 20 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  5. 5.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load + effort (d) load ÷ effort
  6. 6.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
  7. 7.🏋️ An 8 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  8. 8.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ Pushing a crate 8 m took 3760 J of work. What force was used, in newtons?
  10. 10.🏋️ A force of 220 N did 1100 J of work. How many metres did the object move?
  11. 11.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 5100 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A force of 440 N did 3520 J of work. How many metres did the object move?
  13. 13.🏋️ Pushing a crate 7 m took 1540 J of work. What force was used, in newtons?
  14. 14.🏋️ A machine lifts a load of 60 N when you push with 30 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) very slowly (d) only upwards
  16. 16.🏋️ Pushing a crate 3 m took 30 J of work. What force was used, in newtons?
  17. 17.🏋️ A force of 150 N did 300 J of work. How many metres did the object move?
  18. 18.🏋️ A machine lifts a load of 260 N when you push with 130 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A 14 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  20. 20.🏋️ A force of 200 N did 400 J of work. How many metres did the object move?
  21. 21.🏋️ A force of 370 N did 2960 J of work. How many metres did the object move?
  22. 22.🏋️ A machine lifts a load of 1140 N when you push with 190 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ A force of 280 N pushes a cart 4 m along the floor. How much work is done, in joules?
  24. 24.🏋️ Pushing a crate 10 m took 4900 J of work. What force was used, in newtons?
  25. 25.🏋️ Pushing a crate 6 m took 1680 J of work. What force was used, in newtons?
  26. 26.🏋️ A 15 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2250 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ Pushing a crate 3 m took 1350 J of work. What force was used, in newtons?
  29. 29.🏋️ A force of 270 N did 1350 J of work. How many metres did the object move?
  30. 30.🏋️ An 18 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  31. 31.🏋️ A machine lifts a load of 120 N when you push with 30 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ A 6 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  33. 33.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) less effort (d) no effort
  34. 34.🏋️ A force of 270 N pushes a cart 3 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A force of 460 N pushes a cart 3 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A machine lifts a load of 240 N when you push with 60 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 150 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ A force of 170 N did 850 J of work. How many metres did the object move?
  39. 39.🏋️ Pushing a crate 3 m took 510 J of work. What force was used, in newtons?
  40. 40.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2850 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. 270
  2. no, work stays the same
  3. 8
  4. 600
  5. load ÷ effort
  6. joule (J)
  7. 400
  8. 200
  9. 470
  10. 5
  11. 850
  12. 8
  13. 220
  14. 2
  15. through a distance
  16. 10
  17. 2
  18. 2
  19. 420
  20. 2
  21. 8
  22. 6
  23. 1120
  24. 490
  25. 280
  26. 450
  27. 450
  28. 450
  29. 5
  30. 720
  31. 4
  32. 300
  33. less effort
  34. 810
  35. 1380
  36. 4
  37. 50
  38. 5
  39. 170
  40. 950

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