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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 841 · 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 12 m long and rises 3 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ A force of 130 N did 1170 J of work. How many metres did the object move?
  3. 3.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) effort ÷ load (d) load × effort
  4. 4.🏋️ A force of 40 N pushes a cart 9 m along the floor. How much work is done, in joules?
  5. 5.🏋️ A machine lifts a load of 180 N when you push with 60 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) newton (N) (d) metre (m)
  7. 7.🏋️ A force of 410 N pushes a cart 2 m along the floor. How much work is done, in joules?
  8. 8.🏋️ An 18 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  9. 9.🏋️ Pushing a crate 1 m took 70 J of work. What force was used, in newtons?
  10. 10.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ A force of 20 N did 20 J of work. How many metres did the object move?
  12. 12.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1950 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) more effort (d) less effort
  14. 14.🏋️ An 18 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  15. 15.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A 7 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  17. 17.🏋️ A force of 100 N pushes a cart 3 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A machine lifts a load of 300 N when you push with 50 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ Pushing a crate 5 m took 2150 J of work. What force was used, in newtons?
  20. 20.🏋️ A force of 430 N did 4300 J of work. How many metres did the object move?
  21. 21.🏋️ A force of 430 N pushes a cart 3 m along the floor. How much work is done, in joules?
  22. 22.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) no, work stays the same (d) yes, always
  23. 23.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
  24. 24.🏋️ A machine lifts a load of 800 N when you push with 160 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ A force of 430 N did 430 J of work. How many metres did the object move?
  26. 26.🏋️ A machine lifts a load of 60 N when you push with 10 N. What is its mechanical advantage (MA)?
  27. 27.🏋️ A machine lifts a load of 720 N when you push with 120 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ A machine lifts a load of 220 N when you push with 110 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ A force of 200 N did 800 J of work. How many metres did the object move?
  30. 30.🏋️ A force of 430 N did 860 J of work. How many metres did the object move?
  31. 31.🏋️ A machine lifts a load of 550 N when you push with 110 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ Pushing a crate 4 m took 2000 J of work. What force was used, in newtons?
  33. 33.🏋️ A force of 10 N did 70 J of work. How many metres did the object move?
  34. 34.🏋️ A force of 380 N pushes a cart 8 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A force of 250 N pushes a cart 8 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A 19 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  37. 37.🏋️ A machine lifts a load of 280 N when you push with 70 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ A 5 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  39. 39.🏋️ A force of 460 N did 2300 J of work. How many metres did the object move?
  40. 40.🏋️ Pushing a crate 2 m took 540 J of work. What force was used, in newtons?

Answer key

  1. 300
  2. 9
  3. load ÷ effort
  4. 360
  5. 3
  6. joule (J)
  7. 820
  8. 180
  9. 70
  10. 600
  11. 1
  12. 650
  13. less effort
  14. 540
  15. 3
  16. 210
  17. 300
  18. 6
  19. 430
  20. 10
  21. 1290
  22. no, work stays the same
  23. through a distance
  24. 5
  25. 1
  26. 6
  27. 6
  28. 2
  29. 4
  30. 2
  31. 5
  32. 500
  33. 7
  34. 3040
  35. 2000
  36. 950
  37. 4
  38. 150
  39. 5
  40. 270

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