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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 324 · 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.🏋️ 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.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) metre (m) (d) watt hour
  3. 3.🏋️ A force of 320 N pushes a cart 5 m along the floor. How much work is done, in joules?
  4. 4.🏋️ A machine lifts a load of 900 N when you push with 150 N. What is its mechanical advantage (MA)?
  5. 5.🏋️ A force of 200 N pushes a cart 7 m along the floor. How much work is done, in joules?
  6. 6.🏋️ 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)
  7. 7.🏋️ A 7 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  8. 8.🏋️ A force of 10 N did 20 J of work. How many metres did the object move?
  9. 9.🏋️ A 1 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ A force of 60 N did 360 J of work. How many metres did the object move?
  11. 11.🏋️ Pushing a crate 8 m took 1920 J of work. What force was used, in newtons?
  12. 12.🏋️ A machine lifts a load of 300 N when you push with 60 N. What is its mechanical advantage (MA)?
  13. 13.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) effort ÷ load (d) load × effort
  14. 14.🏋️ A force of 300 N did 3000 J of work. How many metres did the object move?
  15. 15.🏋️ A force of 280 N pushes a cart 9 m along the floor. How much work is done, in joules?
  16. 16.🏋️ Pushing a crate 8 m took 560 J of work. What force was used, in newtons?
  17. 17.🏋️ A machine lifts a load of 120 N when you push with 20 N. What is its mechanical advantage (MA)?
  18. 18.🏋️ Pushing a crate 7 m took 2520 J of work. What force was used, in newtons?
  19. 19.🏋️ An 11 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  20. 20.🏋️ A 9 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  21. 21.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1100 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ A force of 370 N pushes a cart 9 m along the floor. How much work is done, in joules?
  23. 23.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) only on Mondays (d) no, work stays the same
  24. 24.🏋️ A force of 190 N pushes a cart 1 m along the floor. How much work is done, in joules?
  25. 25.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) very slowly (d) through a distance
  26. 26.🏋️ An 11 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ Pushing a crate 9 m took 2070 J of work. What force was used, in newtons?
  28. 28.🏋️ 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?
  29. 29.🏋️ A machine lifts a load of 240 N when you push with 40 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ Pushing a crate 9 m took 3870 J of work. What force was used, in newtons?
  31. 31.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1100 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ 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)
  33. 33.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) more effort (d) less effort
  34. 34.🏋️ A force of 150 N pushes a cart 1 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A machine lifts a load of 140 N when you push with 70 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ A 10 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.🏋️ Pushing a crate 7 m took 840 J of work. What force was used, in newtons?
  38. 38.🏋️ A force of 340 N did 1020 J of work. How many metres did the object move?
  39. 39.🏋️ A force of 290 N did 870 J of work. How many metres did the object move?
  40. 40.🏋️ A 19 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. 120
  2. joule (J)
  3. 1600
  4. 6
  5. 1400
  6. 550
  7. 70
  8. 2
  9. 50
  10. 6
  11. 240
  12. 5
  13. load ÷ effort
  14. 10
  15. 2520
  16. 70
  17. 6
  18. 360
  19. 330
  20. 270
  21. 550
  22. 3330
  23. no, work stays the same
  24. 190
  25. through a distance
  26. 440
  27. 230
  28. 250
  29. 6
  30. 430
  31. 550
  32. 300
  33. less effort
  34. 150
  35. 2
  36. 100
  37. 120
  38. 3
  39. 3
  40. 570

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