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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 53 · 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 3 m long and rises 1 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ A force of 80 N did 80 J of work. How many metres did the object move?
  3. 3.🏋️ A 13 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  4. 4.🏋️ Pushing a crate 6 m took 900 J of work. What force was used, in newtons?
  5. 5.🏋️ A machine lifts a load of 260 N when you push with 130 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ A machine lifts a load of 340 N when you push with 170 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ A force of 160 N pushes a cart 6 m along the floor. How much work is done, in joules?
  8. 8.🏋️ A 15 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  9. 9.🏋️ A machine lifts a load of 550 N when you push with 110 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) only upwards (d) without moving it
  11. 11.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 3900 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A force of 400 N did 2400 J of work. How many metres did the object move?
  13. 13.🏋️ A force of 30 N did 120 J of work. How many metres did the object move?
  14. 14.🏋️ A force of 350 N did 1750 J of work. How many metres did the object move?
  15. 15.🏋️ Pushing a crate 2 m took 820 J of work. What force was used, in newtons?
  16. 16.🏋️ 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)
  17. 17.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) no, work stays the same (d) yes, always
  18. 18.🏋️ A force of 210 N did 1050 J of work. How many metres did the object move?
  19. 19.🏋️ A 4 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  20. 20.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) watt hour (d) joule (J)
  21. 21.🏋️ A force of 10 N did 10 J of work. How many metres did the object move?
  22. 22.🏋️ A force of 160 N pushes a cart 1 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A 16 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  24. 24.🏋️ A machine lifts a load of 210 N when you push with 70 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ Pushing a crate 9 m took 2160 J of work. What force was used, in newtons?
  26. 26.🏋️ A 9 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 5 m long and rises 1 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ A 6 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  29. 29.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ Pushing a crate 6 m took 2220 J of work. What force was used, in newtons?
  31. 31.🏋️ Pushing a crate 6 m took 660 J of work. What force was used, in newtons?
  32. 32.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) more effort (d) no effort
  33. 33.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ A 5 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  35. 35.🏋️ A force of 80 N did 800 J of work. How many metres did the object move?
  36. 36.🏋️ A force of 240 N did 2160 J of work. How many metres did the object move?
  37. 37.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 1250 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ A machine lifts a load of 180 N when you push with 60 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
  40. 40.🏋️ A force of 480 N did 480 J of work. How many metres did the object move?

Answer key

  1. 800
  2. 1
  3. 260
  4. 150
  5. 2
  6. 2
  7. 960
  8. 600
  9. 5
  10. through a distance
  11. 650
  12. 6
  13. 4
  14. 5
  15. 410
  16. 650
  17. no, work stays the same
  18. 5
  19. 40
  20. joule (J)
  21. 1
  22. 160
  23. 320
  24. 3
  25. 240
  26. 450
  27. 200
  28. 60
  29. 250
  30. 370
  31. 110
  32. less effort
  33. 2
  34. 50
  35. 10
  36. 9
  37. 250
  38. 3
  39. load ÷ effort
  40. 1

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