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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 721 · 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.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) through a distance (d) without moving it
  2. 2.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load + effort (d) load × effort
  3. 3.🏋️ An 8 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  4. 4.🏋️ Pushing a crate 10 m took 400 J of work. What force was used, in newtons?
  5. 5.🏋️ A force of 140 N pushes a cart 1 m along the floor. How much work is done, in joules?
  6. 6.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3250 N box up it, in newtons? (ideal ramp, no friction)
  7. 7.🏋️ A machine lifts a load of 120 N when you push with 60 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ Pushing a crate 8 m took 3440 J of work. What force was used, in newtons?
  10. 10.🏋️ A 12 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  11. 11.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3500 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) the same effort (d) less effort
  13. 13.🏋️ A force of 340 N did 2720 J of work. How many metres did the object move?
  14. 14.🏋️ A force of 90 N pushes a cart 4 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A force of 340 N pushes a cart 5 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A force of 450 N did 1350 J of work. How many metres did the object move?
  17. 17.🏋️ A force of 10 N pushes a cart 9 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  19. 19.🏋️ An 11 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.🏋️ Pushing a crate 6 m took 2040 J of work. What force was used, in newtons?
  21. 21.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ 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
  23. 23.🏋️ A force of 430 N did 1720 J of work. How many metres did the object move?
  24. 24.🏋️ A 3 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  25. 25.🏋️ A force of 430 N pushes a cart 1 m along the floor. How much work is done, in joules?
  26. 26.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) metre (m) (d) watt hour
  27. 27.🏋️ A force of 280 N pushes a cart 7 m along the floor. How much work is done, in joules?
  28. 28.🏋️ A machine lifts a load of 180 N when you push with 60 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ A force of 310 N did 620 J of work. How many metres did the object move?
  30. 30.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 150 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ Pushing a crate 10 m took 1700 J of work. What force was used, in newtons?
  33. 33.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 3250 N box up it, in newtons? (ideal ramp, no friction)
  34. 34.🏋️ A machine lifts a load of 400 N when you push with 80 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A force of 10 N pushes a cart 7 m along the floor. How much work is done, in joules?
  36. 36.🏋️ Pushing a crate 3 m took 420 J of work. What force was used, in newtons?
  37. 37.🏋️ A machine lifts a load of 180 N when you push with 30 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ A force of 140 N pushes a cart 9 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A 17 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ Pushing a crate 4 m took 840 J of work. What force was used, in newtons?

Answer key

  1. through a distance
  2. load ÷ effort
  3. 80
  4. 40
  5. 140
  6. 650
  7. 2
  8. 600
  9. 430
  10. 360
  11. 700
  12. less effort
  13. 8
  14. 360
  15. 1700
  16. 3
  17. 90
  18. 150
  19. 550
  20. 340
  21. 500
  22. no, work stays the same
  23. 4
  24. 150
  25. 430
  26. joule (J)
  27. 1960
  28. 3
  29. 2
  30. 50
  31. 2
  32. 170
  33. 650
  34. 5
  35. 70
  36. 140
  37. 6
  38. 1260
  39. 680
  40. 210

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