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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 906 · 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.

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  1. 1.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ A 6 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ A machine lifts a load of 240 N when you push with 80 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ Pushing a crate 9 m took 3780 J of work. What force was used, in newtons?
  5. 5.🏋️ A 10 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  6. 6.🏋️ A force of 310 N pushes a cart 1 m along the floor. How much work is done, in joules?
  7. 7.🏋️ A force of 220 N did 880 J of work. How many metres did the object move?
  8. 8.🏋️ A force of 80 N did 80 J of work. How many metres did the object move?
  9. 9.🏋️ A 3 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ A force of 80 N pushes a cart 1 m along the floor. How much work is done, in joules?
  11. 11.🏋️ A force of 110 N pushes a cart 8 m along the floor. How much work is done, in joules?
  12. 12.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ A machine lifts a load of 560 N when you push with 140 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ A force of 20 N pushes a cart 7 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) more effort (d) less effort
  16. 16.🏋️ A force of 500 N did 2500 J of work. How many metres did the object move?
  17. 17.🏋️ A force of 110 N pushes a cart 9 m along the floor. How much work is done, in joules?
  18. 18.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) watt hour (d) newton (N)
  19. 19.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ A force of 370 N pushes a cart 2 m along the floor. How much work is done, in joules?
  21. 21.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) very slowly (d) through a distance
  22. 22.🏋️ Pushing a crate 7 m took 2100 J of work. What force was used, in newtons?
  23. 23.🏋️ A force of 450 N did 4050 J of work. How many metres did the object move?
  24. 24.🏋️ A force of 420 N did 2940 J of work. How many metres did the object move?
  25. 25.🏋️ Pushing a crate 1 m took 210 J of work. What force was used, in newtons?
  26. 26.🏋️ Pushing a crate 8 m took 2400 J of work. What force was used, in newtons?
  27. 27.🏋️ A force of 330 N did 1650 J of work. How many metres did the object move?
  28. 28.🏋️ A force of 420 N did 420 J of work. How many metres did the object move?
  29. 29.🏋️ An 8 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  30. 30.🏋️ Pushing a crate 7 m took 2590 J of work. What force was used, in newtons?
  31. 31.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load × effort (d) load ÷ effort
  32. 32.🏋️ A machine lifts a load of 420 N when you push with 140 N. What is its mechanical advantage (MA)?
  33. 33.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) no, work stays the same (c) only on Mondays (d) yes, always
  34. 34.🏋️ Pushing a crate 5 m took 1300 J of work. What force was used, in newtons?
  35. 35.🏋️ A 2 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  36. 36.🏋️ A force of 60 N pushes a cart 4 m along the floor. How much work is done, in joules?
  37. 37.🏋️ A 20 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  38. 38.🏋️ A force of 420 N did 1260 J of work. How many metres did the object move?
  39. 39.🏋️ Pushing a crate 3 m took 420 J of work. What force was used, in newtons?
  40. 40.🏋️ A 16 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. 400
  2. 240
  3. 3
  4. 420
  5. 200
  6. 310
  7. 4
  8. 1
  9. 90
  10. 80
  11. 880
  12. 750
  13. 4
  14. 140
  15. less effort
  16. 5
  17. 990
  18. joule (J)
  19. 2
  20. 740
  21. through a distance
  22. 300
  23. 9
  24. 7
  25. 210
  26. 300
  27. 5
  28. 1
  29. 240
  30. 370
  31. load ÷ effort
  32. 3
  33. no, work stays the same
  34. 260
  35. 20
  36. 240
  37. 400
  38. 3
  39. 140
  40. 480

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