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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 757 · 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 force of 80 N pushes a cart 2 m along the floor. How much work is done, in joules?
  2. 2.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ A force of 170 N pushes a cart 3 m along the floor. How much work is done, in joules?
  4. 4.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) no, work stays the same (d) yes, by half
  5. 5.🏋️ 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)
  6. 6.🏋️ A force of 400 N did 3600 J of work. How many metres did the object move?
  7. 7.🏋️ A machine lifts a load of 180 N when you push with 60 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) less effort (d) no effort
  9. 9.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) without moving it (d) only upwards
  10. 10.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1350 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ Pushing a crate 3 m took 780 J of work. What force was used, in newtons?
  12. 12.🏋️ A force of 120 N did 720 J of work. How many metres did the object move?
  13. 13.🏋️ A force of 470 N did 2820 J of work. How many metres did the object move?
  14. 14.🏋️ A force of 10 N pushes a cart 1 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A force of 140 N pushes a cart 3 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A force of 60 N did 240 J of work. How many metres did the object move?
  17. 17.🏋️ An 8 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  18. 18.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
  19. 19.🏋️ A machine lifts a load of 120 N when you push with 60 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ A 19 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  21. 21.🏋️ A 20 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  22. 22.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 3200 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ A 6 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  24. 24.🏋️ A 14 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  25. 25.🏋️ A force of 10 N pushes a cart 6 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A machine lifts a load of 600 N when you push with 200 N. What is its mechanical advantage (MA)?
  27. 27.🏋️ A 7 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  28. 28.🏋️ Pushing a crate 3 m took 210 J of work. What force was used, in newtons?
  29. 29.🏋️ A force of 140 N pushes a cart 1 m along the floor. How much work is done, in joules?
  30. 30.🏋️ Pushing a crate 6 m took 540 J of work. What force was used, in newtons?
  31. 31.🏋️ Pushing a crate 6 m took 1380 J of work. What force was used, in newtons?
  32. 32.🏋️ Pushing a crate 6 m took 1140 J of work. What force was used, in newtons?
  33. 33.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ A force of 10 N did 60 J of work. How many metres did the object move?
  35. 35.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 4250 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ Pushing a crate 1 m took 430 J of work. What force was used, in newtons?
  37. 37.🏋️ A machine lifts a load of 280 N when you push with 140 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ A 2 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  39. 39.🏋️ Pushing a crate 4 m took 760 J of work. What force was used, in newtons?
  40. 40.🏋️ A machine lifts a load of 100 N when you push with 20 N. What is its mechanical advantage (MA)?

Answer key

  1. 160
  2. 250
  3. 510
  4. no, work stays the same
  5. 750
  6. 9
  7. 3
  8. less effort
  9. through a distance
  10. 450
  11. 260
  12. 6
  13. 6
  14. 10
  15. 420
  16. 4
  17. 160
  18. joule (J)
  19. 2
  20. 950
  21. 1000
  22. 800
  23. 60
  24. 280
  25. 60
  26. 3
  27. 280
  28. 70
  29. 140
  30. 90
  31. 230
  32. 190
  33. 2
  34. 6
  35. 850
  36. 430
  37. 2
  38. 80
  39. 190
  40. 5

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