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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 891 · 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 450 N when you push with 90 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ 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?
  3. 3.🏋️ A longer ramp to the same height needs … (a) no effort (b) less effort (c) more effort (d) the same effort
  4. 4.🏋️ A force of 200 N did 600 J of work. How many metres did the object move?
  5. 5.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) only upwards (d) through a distance
  6. 6.🏋️ A machine lifts a load of 140 N when you push with 70 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) no, work stays the same (d) yes, by half
  8. 8.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load + effort (d) load × effort
  9. 9.🏋️ A force of 180 N did 1260 J of work. How many metres did the object move?
  10. 10.🏋️ A 20 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  11. 11.🏋️ A force of 400 N did 1600 J of work. How many metres did the object move?
  12. 12.🏋️ A force of 230 N did 230 J of work. How many metres did the object move?
  13. 13.🏋️ A machine lifts a load of 550 N when you push with 110 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ A force of 280 N did 2240 J of work. How many metres did the object move?
  15. 15.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 2500 N box up it, in newtons? (ideal ramp, no friction)
  16. 16.🏋️ A force of 210 N did 1890 J of work. How many metres did the object move?
  17. 17.🏋️ A machine lifts a load of 1200 N when you push with 200 N. What is its mechanical advantage (MA)?
  18. 18.🏋️ A force of 70 N pushes a cart 1 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A force of 290 N pushes a cart 5 m along the floor. How much work is done, in joules?
  20. 20.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) watt hour (d) newton (N)
  21. 21.🏋️ A machine lifts a load of 1020 N when you push with 170 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A force of 470 N did 940 J of work. How many metres did the object move?
  23. 23.🏋️ Pushing a crate 4 m took 1960 J of work. What force was used, in newtons?
  24. 24.🏋️ A force of 260 N pushes a cart 1 m along the floor. How much work is done, in joules?
  25. 25.🏋️ An 8 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  26. 26.🏋️ 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?
  27. 27.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1300 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1050 N box up it, in newtons? (ideal ramp, no friction)
  29. 29.🏋️ A force of 40 N did 160 J of work. How many metres did the object move?
  30. 30.🏋️ A force of 250 N did 2250 J of work. How many metres did the object move?
  31. 31.🏋️ A force of 210 N pushes a cart 3 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A force of 230 N pushes a cart 5 m along the floor. How much work is done, in joules?
  33. 33.🏋️ A force of 330 N pushes a cart 3 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A force of 110 N did 880 J of work. How many metres did the object move?
  35. 35.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
  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 force of 390 N pushes a cart 10 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ A force of 350 N did 1750 J of work. How many metres did the object move?
  40. 40.🏋️ A force of 310 N did 930 J of work. How many metres did the object move?

Answer key

  1. 5
  2. 20
  3. less effort
  4. 3
  5. through a distance
  6. 2
  7. no, work stays the same
  8. load ÷ effort
  9. 7
  10. 1000
  11. 4
  12. 1
  13. 5
  14. 8
  15. 500
  16. 9
  17. 6
  18. 70
  19. 1450
  20. joule (J)
  21. 6
  22. 2
  23. 490
  24. 260
  25. 400
  26. 550
  27. 650
  28. 350
  29. 4
  30. 9
  31. 630
  32. 1150
  33. 990
  34. 8
  35. 600
  36. 3
  37. 3900
  38. 400
  39. 5
  40. 3

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