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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 646 · 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 machine lifts a load of 240 N when you push with 80 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ An 18 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ A force of 320 N did 2560 J of work. How many metres did the object move?
  4. 4.🏋️ 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)
  5. 5.🏋️ Pushing a crate 10 m took 3700 J of work. What force was used, in newtons?
  6. 6.🏋️ A machine lifts a load of 520 N when you push with 130 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ A force of 420 N did 2520 J of work. How many metres did the object move?
  8. 8.🏋️ A force of 150 N pushes a cart 7 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A machine lifts a load of 120 N when you push with 60 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ A machine lifts a load of 140 N when you push with 70 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ 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)
  12. 12.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load × effort (d) load ÷ effort
  13. 13.🏋️ A machine lifts a load of 160 N when you push with 80 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ An 11 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  15. 15.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) yes, by half (d) no, work stays the same
  16. 16.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ Pushing a crate 1 m took 90 J of work. What force was used, in newtons?
  18. 18.🏋️ A force of 260 N pushes a cart 2 m along the floor. How much work is done, in joules?
  19. 19.🏋️ Pushing a crate 3 m took 1350 J of work. What force was used, in newtons?
  20. 20.🏋️ Pushing a crate 10 m took 900 J of work. What force was used, in newtons?
  21. 21.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 3200 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ 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?
  23. 23.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 2750 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
  25. 25.🏋️ A force of 130 N pushes a cart 5 m along the floor. How much work is done, in joules?
  26. 26.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
  27. 27.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) less effort (d) the same effort
  28. 28.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 150 N box up it, in newtons? (ideal ramp, no friction)
  29. 29.🏋️ Pushing a crate 8 m took 1760 J of work. What force was used, in newtons?
  30. 30.🏋️ Pushing a crate 4 m took 400 J of work. What force was used, in newtons?
  31. 31.🏋️ A force of 430 N pushes a cart 9 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A force of 330 N pushes a cart 5 m along the floor. How much work is done, in joules?
  33. 33.🏋️ Pushing a crate 4 m took 1840 J of work. What force was used, in newtons?
  34. 34.🏋️ A force of 500 N pushes a cart 1 m along the floor. How much work is done, in joules?
  35. 35.🏋️ Pushing a crate 10 m took 2100 J of work. What force was used, in newtons?
  36. 36.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ A force of 340 N pushes a cart 8 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ A machine lifts a load of 20 N when you push with 10 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A force of 150 N pushes a cart 9 m along the floor. How much work is done, in joules?

Answer key

  1. 3
  2. 720
  3. 8
  4. 700
  5. 370
  6. 4
  7. 6
  8. 1050
  9. 2
  10. 2
  11. 650
  12. load ÷ effort
  13. 2
  14. 220
  15. no, work stays the same
  16. 200
  17. 90
  18. 520
  19. 450
  20. 90
  21. 800
  22. 120
  23. 550
  24. through a distance
  25. 650
  26. joule (J)
  27. less effort
  28. 50
  29. 220
  30. 100
  31. 3870
  32. 1650
  33. 460
  34. 500
  35. 210
  36. 600
  37. 2720
  38. 400
  39. 2
  40. 1350

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