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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 603 · 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 smooth ramp is 6 m long and rises 2 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ 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)
  3. 3.🏋️ 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
  4. 4.🏋️ Pushing a crate 7 m took 2170 J of work. What force was used, in newtons?
  5. 5.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load × effort (d) load ÷ effort
  6. 6.🏋️ Pushing a crate 4 m took 1680 J of work. What force was used, in newtons?
  7. 7.🏋️ A machine lifts a load of 360 N when you push with 180 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ A machine lifts a load of 480 N when you push with 160 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ A force of 20 N pushes a cart 1 m along the floor. How much work is done, in joules?
  10. 10.🏋️ A machine lifts a load of 960 N when you push with 160 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ A machine lifts a load of 420 N when you push with 70 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ 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?
  13. 13.🏋️ A machine lifts a load of 400 N when you push with 80 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) through a distance (d) very slowly
  15. 15.🏋️ A force of 200 N pushes a cart 9 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A machine lifts a load of 300 N when you push with 60 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ Pushing a crate 1 m took 90 J of work. What force was used, in newtons?
  18. 18.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) metre (m) (d) newton (N)
  19. 19.🏋️ A 2 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  20. 20.🏋️ Pushing a crate 6 m took 2820 J of work. What force was used, in newtons?
  21. 21.🏋️ A 2 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  22. 22.🏋️ A 13 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.🏋️ Pushing a crate 8 m took 3520 J of work. What force was used, in newtons?
  24. 24.🏋️ Pushing a crate 2 m took 940 J of work. What force was used, in newtons?
  25. 25.🏋️ A longer ramp to the same height needs … (a) less effort (b) more effort (c) no effort (d) the same effort
  26. 26.🏋️ A force of 160 N did 800 J of work. How many metres did the object move?
  27. 27.🏋️ Pushing a crate 4 m took 320 J of work. What force was used, in newtons?
  28. 28.🏋️ A force of 450 N pushes a cart 7 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ A 1 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  31. 31.🏋️ 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)
  32. 32.🏋️ A force of 110 N did 770 J of work. How many metres did the object move?
  33. 33.🏋️ Pushing a crate 4 m took 1360 J of work. What force was used, in newtons?
  34. 34.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2550 N box up it, in newtons? (ideal ramp, no friction)
  35. 35.🏋️ A force of 130 N pushes a cart 4 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ A machine lifts a load of 600 N when you push with 150 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ A 17 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  39. 39.🏋️ A force of 270 N pushes a cart 3 m along the floor. How much work is done, in joules?
  40. 40.🏋️ 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?

Answer key

  1. 700
  2. 450
  3. no, work stays the same
  4. 310
  5. load ÷ effort
  6. 420
  7. 2
  8. 3
  9. 20
  10. 6
  11. 6
  12. 330
  13. 5
  14. through a distance
  15. 1800
  16. 5
  17. 90
  18. joule (J)
  19. 40
  20. 470
  21. 20
  22. 520
  23. 440
  24. 470
  25. less effort
  26. 5
  27. 80
  28. 3150
  29. 2
  30. 10
  31. 800
  32. 7
  33. 340
  34. 850
  35. 520
  36. 400
  37. 4
  38. 340
  39. 810
  40. 220

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