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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 793 · 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 50 N when you push with 10 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ A machine lifts a load of 260 N when you push with 130 N. What is its mechanical advantage (MA)?
  3. 3.🏋️ Pushing a crate 5 m took 400 J of work. What force was used, in newtons?
  4. 4.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) only upwards (d) without moving it
  5. 5.🏋️ Pushing a crate 5 m took 300 J of work. What force was used, in newtons?
  6. 6.🏋️ A machine lifts a load of 160 N when you push with 40 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ A force of 210 N pushes a cart 6 m along the floor. How much work is done, in joules?
  8. 8.🏋️ Pushing a crate 4 m took 520 J of work. What force was used, in newtons?
  9. 9.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 3500 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) joule (J) (d) watt hour
  11. 11.🏋️ A force of 380 N did 1520 J of work. How many metres did the object move?
  12. 12.🏋️ Pushing a crate 5 m took 900 J of work. What force was used, in newtons?
  13. 13.🏋️ A force of 290 N did 580 J of work. How many metres did the object move?
  14. 14.🏋️ A 7 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  15. 15.🏋️ 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?
  16. 16.🏋️ Pushing a crate 3 m took 840 J of work. What force was used, in newtons?
  17. 17.🏋️ A force of 460 N did 920 J of work. How many metres did the object move?
  18. 18.🏋️ Pushing a crate 10 m took 3000 J of work. What force was used, in newtons?
  19. 19.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) load ÷ effort (d) effort ÷ load
  20. 20.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) no, work stays the same (c) yes, always (d) yes, by half
  21. 21.🏋️ 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)
  22. 22.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ A 15 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  24. 24.🏋️ Pushing a crate 8 m took 2880 J of work. What force was used, in newtons?
  25. 25.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  26. 26.🏋️ A force of 120 N pushes a cart 9 m along the floor. How much work is done, in joules?
  27. 27.🏋️ A 2 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  28. 28.🏋️ A force of 240 N did 1920 J of work. How many metres did the object move?
  29. 29.🏋️ A force of 230 N did 690 J of work. How many metres did the object move?
  30. 30.🏋️ A machine lifts a load of 520 N when you push with 130 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 4200 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ A force of 20 N did 120 J of work. How many metres did the object move?
  33. 33.🏋️ A force of 320 N did 2240 J of work. How many metres did the object move?
  34. 34.🏋️ A 5 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  35. 35.🏋️ A force of 100 N pushes a cart 10 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A force of 250 N did 1500 J of work. How many metres did the object move?
  37. 37.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1250 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ Pushing a crate 10 m took 1400 J of work. What force was used, in newtons?
  39. 39.🏋️ Pushing a crate 3 m took 1110 J of work. What force was used, in newtons?
  40. 40.🏋️ A force of 180 N pushes a cart 1 m along the floor. How much work is done, in joules?

Answer key

  1. 5
  2. 2
  3. 80
  4. through a distance
  5. 60
  6. 4
  7. 1260
  8. 130
  9. 700
  10. joule (J)
  11. 4
  12. 180
  13. 2
  14. 70
  15. 180
  16. 280
  17. 2
  18. 300
  19. load ÷ effort
  20. no, work stays the same
  21. 650
  22. 200
  23. 750
  24. 360
  25. 200
  26. 1080
  27. 40
  28. 8
  29. 3
  30. 4
  31. 700
  32. 6
  33. 7
  34. 250
  35. 1000
  36. 6
  37. 250
  38. 140
  39. 370
  40. 180

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