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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 32 · 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.🏋️ A 4 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  2. 2.🏋️ A 13 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ A force of 340 N did 1700 J of work. How many metres did the object move?
  4. 4.🏋️ A force of 30 N pushes a cart 4 m along the floor. How much work is done, in joules?
  5. 5.🏋️ A force of 140 N pushes a cart 6 m along the floor. How much work is done, in joules?
  6. 6.🏋️ A force of 60 N did 180 J of work. How many metres did the object move?
  7. 7.🏋️ Work is done when a force moves something … (a) through a distance (b) only upwards (c) very slowly (d) without moving it
  8. 8.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ Pushing a crate 2 m took 120 J of work. What force was used, in newtons?
  10. 10.🏋️ Pushing a crate 1 m took 490 J of work. What force was used, in newtons?
  11. 11.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) metre (m) (d) joule (J)
  12. 12.🏋️ Pushing a crate 1 m took 60 J of work. What force was used, in newtons?
  13. 13.🏋️ Pushing a crate 2 m took 460 J of work. What force was used, in newtons?
  14. 14.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ A machine lifts a load of 540 N when you push with 180 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A force of 40 N did 80 J of work. How many metres did the object move?
  17. 17.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, always (d) yes, by half
  18. 18.🏋️ A longer ramp to the same height needs … (a) less effort (b) no effort (c) the same effort (d) more effort
  19. 19.🏋️ A force of 80 N pushes a cart 4 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A force of 460 N did 1840 J of work. How many metres did the object move?
  21. 21.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A force of 450 N did 450 J of work. How many metres did the object move?
  23. 23.🏋️ A machine lifts a load of 510 N when you push with 170 N. What is its mechanical advantage (MA)?
  24. 24.🏋️ A 3 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  25. 25.🏋️ A machine lifts a load of 400 N when you push with 200 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ Pushing a crate 9 m took 1800 J of work. What force was used, in newtons?
  27. 27.🏋️ A 5 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  28. 28.🏋️ 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?
  29. 29.🏋️ A force of 390 N did 1170 J of work. How many metres did the object move?
  30. 30.🏋️ A force of 160 N pushes a cart 10 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ Pushing a crate 9 m took 1440 J of work. What force was used, in newtons?
  33. 33.🏋️ A force of 100 N pushes a cart 10 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A 5 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  35. 35.🏋️ A force of 180 N did 720 J of work. How many metres did the object move?
  36. 36.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
  37. 37.🏋️ A force of 340 N pushes a cart 2 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 500 N did 500 J of work. How many metres did the object move?
  39. 39.🏋️ A force of 200 N did 200 J of work. How many metres did the object move?
  40. 40.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 4200 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. 120
  2. 130
  3. 5
  4. 120
  5. 840
  6. 3
  7. through a distance
  8. 300
  9. 60
  10. 490
  11. joule (J)
  12. 60
  13. 230
  14. 100
  15. 3
  16. 2
  17. no, work stays the same
  18. less effort
  19. 320
  20. 4
  21. 5
  22. 1
  23. 3
  24. 120
  25. 2
  26. 200
  27. 100
  28. 90
  29. 3
  30. 1600
  31. 50
  32. 160
  33. 1000
  34. 150
  35. 4
  36. load ÷ effort
  37. 680
  38. 1
  39. 1
  40. 700

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