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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 912 · 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.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) newton (N) (d) metre (m)
  2. 2.🏋️ A force of 90 N did 450 J of work. How many metres did the object move?
  3. 3.🏋️ Pushing a crate 5 m took 1400 J of work. What force was used, in newtons?
  4. 4.🏋️ A force of 70 N did 560 J of work. How many metres did the object move?
  5. 5.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) very slowly (d) only upwards
  6. 6.🏋️ Pushing a crate 2 m took 400 J of work. What force was used, in newtons?
  7. 7.🏋️ Pushing a crate 9 m took 1620 J of work. What force was used, in newtons?
  8. 8.🏋️ A force of 10 N pushes a cart 3 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A force of 400 N did 1200 J of work. How many metres did the object move?
  10. 10.🏋️ Pushing a crate 2 m took 660 J of work. What force was used, in newtons?
  11. 11.🏋️ Pushing a crate 1 m took 70 J of work. What force was used, in newtons?
  12. 12.🏋️ A 15 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  13. 13.🏋️ A force of 230 N pushes a cart 1 m along the floor. How much work is done, in joules?
  14. 14.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load × effort (d) load + effort
  15. 15.🏋️ A force of 50 N pushes a cart 4 m along the floor. How much work is done, in joules?
  16. 16.🏋️ Pushing a crate 1 m took 210 J of work. What force was used, in newtons?
  17. 17.🏋️ Pushing a crate 5 m took 1100 J of work. What force was used, in newtons?
  18. 18.🏋️ Pushing a crate 7 m took 2240 J of work. What force was used, in newtons?
  19. 19.🏋️ A 2 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  20. 20.🏋️ A machine lifts a load of 60 N when you push with 30 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) no, work stays the same (c) yes, by half (d) yes, always
  22. 22.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ 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)
  24. 24.🏋️ 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?
  25. 25.🏋️ A force of 80 N did 160 J of work. How many metres did the object move?
  26. 26.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  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 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)
  29. 29.🏋️ A force of 30 N pushes a cart 3 m along the floor. How much work is done, in joules?
  30. 30.🏋️ A force of 160 N pushes a cart 4 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A machine lifts a load of 480 N when you push with 80 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ A force of 60 N pushes a cart 3 m along the floor. How much work is done, in joules?
  33. 33.🏋️ A force of 490 N did 1470 J of work. How many metres did the object move?
  34. 34.🏋️ A machine lifts a load of 120 N when you push with 20 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ A 17 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  37. 37.🏋️ 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?
  38. 38.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) more effort (d) no effort
  40. 40.🏋️ Pushing a crate 7 m took 280 J of work. What force was used, in newtons?

Answer key

  1. joule (J)
  2. 5
  3. 280
  4. 8
  5. through a distance
  6. 200
  7. 180
  8. 30
  9. 3
  10. 330
  11. 70
  12. 300
  13. 230
  14. load ÷ effort
  15. 200
  16. 210
  17. 220
  18. 320
  19. 100
  20. 2
  21. no, work stays the same
  22. 200
  23. 450
  24. 120
  25. 2
  26. 300
  27. 100
  28. 250
  29. 90
  30. 640
  31. 6
  32. 180
  33. 3
  34. 6
  35. 750
  36. 170
  37. 1000
  38. 100
  39. less effort
  40. 40

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