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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 598 · 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.🏋️ An 8 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  2. 2.🏋️ A force of 140 N pushes a cart 6 m along the floor. How much work is done, in joules?
  3. 3.🏋️ 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
  4. 4.🏋️ A 12 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.🏋️ Pushing a crate 10 m took 2300 J of work. What force was used, in newtons?
  6. 6.🏋️ Pushing a crate 9 m took 3420 J of work. What force was used, in newtons?
  7. 7.🏋️ A force of 300 N did 3000 J of work. How many metres did the object move?
  8. 8.🏋️ A machine lifts a load of 100 N when you push with 20 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ A force of 120 N pushes a cart 5 m along the floor. How much work is done, in joules?
  10. 10.🏋️ Pushing a crate 2 m took 160 J of work. What force was used, in newtons?
  11. 11.🏋️ 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?
  12. 12.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ Pushing a crate 6 m took 3000 J of work. What force was used, in newtons?
  14. 14.🏋️ A machine lifts a load of 420 N when you push with 140 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ A force of 390 N did 2340 J of work. How many metres did the object move?
  16. 16.🏋️ A 3 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  17. 17.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) without moving it (d) only upwards
  18. 18.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) newton (N) (d) metre (m)
  19. 19.🏋️ Pushing a crate 10 m took 3800 J of work. What force was used, in newtons?
  20. 20.🏋️ A longer ramp to the same height needs … (a) less effort (b) no effort (c) the same effort (d) more effort
  21. 21.🏋️ A force of 190 N pushes a cart 3 m along the floor. How much work is done, in joules?
  22. 22.🏋️ A machine lifts a load of 1200 N when you push with 200 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ Pushing a crate 3 m took 450 J of work. What force was used, in newtons?
  24. 24.🏋️ A force of 320 N did 640 J of work. How many metres did the object move?
  25. 25.🏋️ A machine lifts a load of 180 N when you push with 90 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) effort ÷ load (d) load + effort
  28. 28.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  29. 29.🏋️ A 16 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  30. 30.🏋️ Pushing a crate 1 m took 350 J of work. What force was used, in newtons?
  31. 31.🏋️ A force of 200 N pushes a cart 3 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A force of 240 N did 1200 J of work. How many metres did the object move?
  33. 33.🏋️ A 19 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  34. 34.🏋️ A 9 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  35. 35.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 3250 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ Pushing a crate 9 m took 990 J of work. What force was used, in newtons?
  38. 38.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1300 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ A force of 260 N pushes a cart 7 m along the floor. How much work is done, in joules?
  40. 40.🏋️ A 3 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. 80
  2. 840
  3. no, work stays the same
  4. 360
  5. 230
  6. 380
  7. 10
  8. 5
  9. 600
  10. 80
  11. 60
  12. 300
  13. 500
  14. 3
  15. 6
  16. 150
  17. through a distance
  18. joule (J)
  19. 380
  20. less effort
  21. 570
  22. 6
  23. 150
  24. 2
  25. 2
  26. 400
  27. load ÷ effort
  28. 800
  29. 800
  30. 350
  31. 600
  32. 5
  33. 380
  34. 90
  35. 650
  36. 400
  37. 110
  38. 650
  39. 1820
  40. 60

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