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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 534 · 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 5 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  2. 2.🏋️ A force of 420 N did 2940 J of work. How many metres did the object move?
  3. 3.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) without moving it (d) through a distance
  4. 4.🏋️ A force of 210 N pushes a cart 3 m along the floor. How much work is done, in joules?
  5. 5.🏋️ A 9 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  6. 6.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 1250 N box up it, in newtons? (ideal ramp, no friction)
  7. 7.🏋️ A force of 130 N did 260 J of work. How many metres did the object move?
  8. 8.🏋️ A force of 190 N did 1330 J of work. How many metres did the object move?
  9. 9.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) no, work stays the same (c) yes, always (d) yes, by half
  11. 11.🏋️ A machine lifts a load of 40 N when you push with 20 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) watt hour (d) joule (J)
  13. 13.🏋️ Pushing a crate 1 m took 370 J of work. What force was used, in newtons?
  14. 14.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ A force of 460 N pushes a cart 1 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 1250 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ Pushing a crate 4 m took 120 J of work. What force was used, in newtons?
  18. 18.🏋️ A force of 400 N did 2000 J of work. How many metres did the object move?
  19. 19.🏋️ A force of 90 N pushes a cart 2 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A force of 410 N did 410 J of work. How many metres did the object move?
  21. 21.🏋️ A machine lifts a load of 140 N when you push with 70 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A force of 380 N did 3420 J of work. How many metres did the object move?
  23. 23.🏋️ A force of 270 N did 1620 J of work. How many metres did the object move?
  24. 24.🏋️ A force of 30 N pushes a cart 6 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A force of 110 N pushes a cart 9 m along the floor. How much work is done, in joules?
  26. 26.🏋️ 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?
  27. 27.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) more effort (d) less effort
  28. 28.🏋️ A force of 60 N did 240 J of work. How many metres did the object move?
  29. 29.🏋️ 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?
  30. 30.🏋️ A force of 390 N did 3900 J of work. How many metres did the object move?
  31. 31.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 450 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ Pushing a crate 8 m took 1440 J of work. What force was used, in newtons?
  33. 33.🏋️ Pushing a crate 4 m took 720 J of work. What force was used, in newtons?
  34. 34.🏋️ A force of 170 N did 1360 J of work. How many metres did the object move?
  35. 35.🏋️ A force of 310 N pushes a cart 8 m along the floor. How much work is done, in joules?
  36. 36.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load ÷ effort (d) load + effort
  37. 37.🏋️ A 19 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  38. 38.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 2200 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ 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?
  40. 40.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. 250
  2. 7
  3. through a distance
  4. 630
  5. 360
  6. 250
  7. 2
  8. 7
  9. 2
  10. no, work stays the same
  11. 2
  12. joule (J)
  13. 370
  14. 1000
  15. 460
  16. 250
  17. 30
  18. 5
  19. 180
  20. 1
  21. 2
  22. 9
  23. 6
  24. 180
  25. 990
  26. 100
  27. less effort
  28. 4
  29. 160
  30. 10
  31. 150
  32. 180
  33. 180
  34. 8
  35. 2480
  36. load ÷ effort
  37. 190
  38. 550
  39. 280
  40. 1000

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