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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 63 · 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.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
  2. 2.🏋️ A force of 40 N did 160 J of work. How many metres did the object move?
  3. 3.🏋️ Pushing a crate 3 m took 1260 J of work. What force was used, in newtons?
  4. 4.🏋️ A machine lifts a load of 340 N when you push with 170 N. What is its mechanical advantage (MA)?
  5. 5.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
  6. 6.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 2250 N box up it, in newtons? (ideal ramp, no friction)
  7. 7.🏋️ Pushing a crate 7 m took 3290 J of work. What force was used, in newtons?
  8. 8.🏋️ A machine lifts a load of 560 N when you push with 140 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ Pushing a crate 7 m took 1050 J of work. What force was used, in newtons?
  10. 10.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) yes, by half (d) no, work stays the same
  11. 11.🏋️ A force of 220 N pushes a cart 8 m along the floor. How much work is done, in joules?
  12. 12.🏋️ A force of 350 N did 3150 J of work. How many metres did the object move?
  13. 13.🏋️ Pushing a crate 2 m took 960 J of work. What force was used, in newtons?
  14. 14.🏋️ A force of 430 N did 1290 J of work. How many metres did the object move?
  15. 15.🏋️ A force of 50 N did 150 J of work. How many metres did the object move?
  16. 16.🏋️ In which unit is work measured? (a) watt hour (b) newton (N) (c) joule (J) (d) metre (m)
  17. 17.🏋️ A force of 490 N did 4900 J of work. How many metres did the object move?
  18. 18.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 3250 N box up it, in newtons? (ideal ramp, no friction)
  19. 19.🏋️ Pushing a crate 8 m took 1120 J of work. What force was used, in newtons?
  20. 20.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) more effort (d) no effort
  21. 21.🏋️ A 15 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 15 m long and rises 3 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load ÷ effort (c) effort ÷ load (d) load + effort
  24. 24.🏋️ A machine lifts a load of 60 N when you push with 20 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ Pushing a crate 7 m took 630 J of work. What force was used, in newtons?
  26. 26.🏋️ Pushing a crate 3 m took 660 J of work. What force was used, in newtons?
  27. 27.🏋️ A force of 170 N pushes a cart 6 m along the floor. How much work is done, in joules?
  28. 28.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  29. 29.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A force of 100 N did 300 J of work. How many metres did the object move?
  32. 32.🏋️ A force of 390 N pushes a cart 4 m along the floor. How much work is done, in joules?
  33. 33.🏋️ Pushing a crate 1 m took 370 J of work. What force was used, in newtons?
  34. 34.🏋️ A force of 340 N did 1020 J of work. How many metres did the object move?
  35. 35.🏋️ A 3 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 machine lifts a load of 60 N when you push with 10 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A 12 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  38. 38.🏋️ A machine lifts a load of 200 N when you push with 50 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ A 9 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ 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?

Answer key

  1. through a distance
  2. 4
  3. 420
  4. 2
  5. 800
  6. 450
  7. 470
  8. 4
  9. 150
  10. no, work stays the same
  11. 1760
  12. 9
  13. 480
  14. 3
  15. 3
  16. joule (J)
  17. 10
  18. 650
  19. 140
  20. less effort
  21. 750
  22. 150
  23. load ÷ effort
  24. 3
  25. 90
  26. 220
  27. 1020
  28. 300
  29. 2
  30. 450
  31. 3
  32. 1560
  33. 370
  34. 3
  35. 30
  36. 6
  37. 480
  38. 4
  39. 450
  40. 280

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