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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 36 · 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 force of 170 N pushes a cart 9 m along the floor. How much work is done, in joules?
  2. 2.🏋️ A 9 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ A force of 430 N pushes a cart 6 m along the floor. How much work is done, in joules?
  4. 4.🏋️ A force of 220 N did 1540 J of work. How many metres did the object move?
  5. 5.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2500 N box up it, in newtons? (ideal ramp, no friction)
  6. 6.🏋️ A force of 460 N did 4140 J of work. How many metres did the object move?
  7. 7.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) only on Mondays (d) no, work stays the same
  8. 8.🏋️ A machine lifts a load of 240 N when you push with 80 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 3400 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ Pushing a crate 3 m took 180 J of work. What force was used, in newtons?
  11. 11.🏋️ A machine lifts a load of 400 N when you push with 200 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ A force of 380 N did 3800 J of work. How many metres did the object move?
  13. 13.🏋️ A 20 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  14. 14.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) more effort (d) no effort
  15. 15.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
  16. 16.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) metre (m) (d) newton (N)
  18. 18.🏋️ Pushing a crate 4 m took 1400 J of work. What force was used, in newtons?
  19. 19.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  20. 20.🏋️ A force of 10 N pushes a cart 8 m along the floor. How much work is done, in joules?
  21. 21.🏋️ 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?
  22. 22.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
  23. 23.🏋️ A force of 350 N did 1750 J of work. How many metres did the object move?
  24. 24.🏋️ A force of 270 N pushes a cart 9 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A force of 30 N did 150 J of work. How many metres did the object move?
  26. 26.🏋️ A 6 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ Pushing a crate 10 m took 3400 J of work. What force was used, in newtons?
  28. 28.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  29. 29.🏋️ A 3 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  30. 30.🏋️ A machine lifts a load of 220 N when you push with 110 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ A force of 70 N did 140 J of work. How many metres did the object move?
  32. 32.🏋️ A force of 40 N pushes a cart 2 m along the floor. How much work is done, in joules?
  33. 33.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
  34. 34.🏋️ A machine lifts a load of 360 N when you push with 90 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A 15 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  38. 38.🏋️ A force of 220 N pushes a cart 5 m along the floor. How much work is done, in joules?
  39. 39.🏋️ Pushing a crate 3 m took 1380 J of work. What force was used, in newtons?
  40. 40.🏋️ 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?

Answer key

  1. 1530
  2. 180
  3. 2580
  4. 7
  5. 500
  6. 9
  7. no, work stays the same
  8. 3
  9. 850
  10. 60
  11. 2
  12. 10
  13. 800
  14. less effort
  15. through a distance
  16. 1000
  17. joule (J)
  18. 350
  19. 500
  20. 80
  21. 680
  22. load ÷ effort
  23. 5
  24. 2430
  25. 5
  26. 180
  27. 340
  28. 1000
  29. 90
  30. 2
  31. 2
  32. 80
  33. 350
  34. 4
  35. 2
  36. 3
  37. 150
  38. 1100
  39. 460
  40. 550

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