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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 387 · 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) effort ÷ load (c) load × effort (d) load ÷ effort
  2. 2.🏋️ A force of 50 N did 100 J of work. How many metres did the object move?
  3. 3.🏋️ A force of 10 N did 30 J of work. How many metres did the object move?
  4. 4.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
  5. 5.🏋️ A machine lifts a load of 200 N when you push with 50 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ An 11 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  7. 7.🏋️ A machine lifts a load of 520 N when you push with 130 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ 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)
  9. 9.🏋️ A 7 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 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?
  11. 11.🏋️ A 10 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  12. 12.🏋️ A force of 130 N pushes a cart 5 m along the floor. How much work is done, in joules?
  13. 13.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) newton (N) (d) joule (J)
  14. 14.🏋️ A force of 40 N did 320 J of work. How many metres did the object move?
  15. 15.🏋️ Pushing a crate 8 m took 3040 J of work. What force was used, in newtons?
  16. 16.🏋️ A force of 290 N did 290 J of work. How many metres did the object move?
  17. 17.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) through a distance (d) without moving it
  18. 18.🏋️ A force of 90 N did 720 J of work. How many metres did the object move?
  19. 19.🏋️ A force of 10 N did 80 J of work. How many metres did the object move?
  20. 20.🏋️ A force of 60 N pushes a cart 3 m along the floor. How much work is done, in joules?
  21. 21.🏋️ Pushing a crate 4 m took 960 J of work. What force was used, in newtons?
  22. 22.🏋️ A force of 370 N did 2960 J of work. How many metres did the object move?
  23. 23.🏋️ A force of 20 N did 160 J of work. How many metres did the object move?
  24. 24.🏋️ A force of 500 N pushes a cart 2 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2850 N box up it, in newtons? (ideal ramp, no friction)
  26. 26.🏋️ A 13 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ A force of 90 N pushes a cart 2 m along the floor. How much work is done, in joules?
  28. 28.🏋️ A force of 490 N pushes a cart 2 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A machine lifts a load of 320 N when you push with 160 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ Pushing a crate 4 m took 320 J of work. What force was used, in newtons?
  31. 31.🏋️ Pushing a crate 2 m took 620 J of work. What force was used, in newtons?
  32. 32.🏋️ A force of 290 N did 1450 J of work. How many metres did the object move?
  33. 33.🏋️ A force of 20 N did 80 J of work. How many metres did the object move?
  34. 34.🏋️ A force of 490 N pushes a cart 7 m along the floor. How much work is done, in joules?
  35. 35.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) yes, always (d) no, work stays the same
  36. 36.🏋️ Pushing a crate 7 m took 2170 J of work. What force was used, in newtons?
  37. 37.🏋️ Pushing a crate 8 m took 2080 J of work. What force was used, in newtons?
  38. 38.🏋️ A 2 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  39. 39.🏋️ A machine lifts a load of 360 N when you push with 60 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. load ÷ effort
  2. 2
  3. 3
  4. 3
  5. 4
  6. 220
  7. 4
  8. 800
  9. 350
  10. 950
  11. 400
  12. 650
  13. joule (J)
  14. 8
  15. 380
  16. 1
  17. through a distance
  18. 8
  19. 8
  20. 180
  21. 240
  22. 8
  23. 8
  24. 1000
  25. 950
  26. 130
  27. 180
  28. 980
  29. 2
  30. 80
  31. 310
  32. 5
  33. 4
  34. 3430
  35. no, work stays the same
  36. 310
  37. 260
  38. 80
  39. 6
  40. 500

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