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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 729 · 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.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) load × effort (d) effort ÷ load
  2. 2.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ Pushing a crate 8 m took 1520 J of work. What force was used, in newtons?
  4. 4.🏋️ A force of 500 N did 3500 J of work. How many metres did the object move?
  5. 5.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) no, work stays the same (c) only on Mondays (d) yes, always
  6. 6.🏋️ A force of 450 N pushes a cart 6 m along the floor. How much work is done, in joules?
  7. 7.🏋️ A force of 290 N pushes a cart 6 m along the floor. How much work is done, in joules?
  8. 8.🏋️ Pushing a crate 7 m took 1260 J of work. What force was used, in newtons?
  9. 9.🏋️ 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?
  10. 10.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 3400 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1100 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) metre (m) (d) joule (J)
  13. 13.🏋️ A machine lifts a load of 360 N when you push with 120 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ A machine lifts a load of 280 N when you push with 70 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ An 18 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  16. 16.🏋️ 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?
  17. 17.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ A force of 20 N pushes a cart 1 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A machine lifts a load of 700 N when you push with 140 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ Pushing a crate 6 m took 180 J of work. What force was used, in newtons?
  21. 21.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 100 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ A force of 20 N pushes a cart 7 m along the floor. How much work is done, in joules?
  23. 23.🏋️ Pushing a crate 5 m took 1900 J of work. What force was used, in newtons?
  24. 24.🏋️ A force of 460 N did 4600 J of work. How many metres did the object move?
  25. 25.🏋️ A machine lifts a load of 440 N when you push with 110 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) through a distance (d) very slowly
  27. 27.🏋️ A force of 140 N did 980 J of work. How many metres did the object move?
  28. 28.🏋️ A force of 10 N did 90 J of work. How many metres did the object move?
  29. 29.🏋️ A machine lifts a load of 1020 N when you push with 170 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ Pushing a crate 8 m took 3280 J of work. What force was used, in newtons?
  31. 31.🏋️ A force of 300 N pushes a cart 3 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A machine lifts a load of 100 N when you push with 20 N. What is its mechanical advantage (MA)?
  33. 33.🏋️ A force of 240 N did 1920 J of work. How many metres did the object move?
  34. 34.🏋️ A force of 190 N pushes a cart 2 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A machine lifts a load of 80 N when you push with 20 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ Pushing a crate 7 m took 2520 J of work. What force was used, in newtons?
  37. 37.🏋️ A force of 10 N pushes a cart 7 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A machine lifts a load of 220 N when you push with 110 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ A 4 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ A force of 30 N pushes a cart 5 m along the floor. How much work is done, in joules?

Answer key

  1. load ÷ effort
  2. 150
  3. 190
  4. 7
  5. no, work stays the same
  6. 2700
  7. 1740
  8. 180
  9. 550
  10. 850
  11. 550
  12. joule (J)
  13. 3
  14. 4
  15. 900
  16. 800
  17. 600
  18. 20
  19. 5
  20. 30
  21. 50
  22. 140
  23. 380
  24. 10
  25. 4
  26. through a distance
  27. 7
  28. 9
  29. 6
  30. 410
  31. 900
  32. 5
  33. 8
  34. 380
  35. 4
  36. 360
  37. 70
  38. 2
  39. 120
  40. 150

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