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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 667 · 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 6 m long and rises 3 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ A 3 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 5 m took 2350 J of work. What force was used, in newtons?
  5. 5.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) joule (J) (d) newton (N)
  6. 6.🏋️ Pushing a crate 9 m took 270 J of work. What force was used, in newtons?
  7. 7.🏋️ A force of 100 N did 500 J of work. How many metres did the object move?
  8. 8.🏋️ Pushing a crate 3 m took 930 J of work. What force was used, in newtons?
  9. 9.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) without moving it (d) through a distance
  10. 10.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ A force of 450 N pushes a cart 8 m along the floor. How much work is done, in joules?
  12. 12.🏋️ A force of 110 N pushes a cart 10 m along the floor. How much work is done, in joules?
  13. 13.🏋️ A force of 130 N pushes a cart 5 m along the floor. How much work is done, in joules?
  14. 14.🏋️ An 8 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.🏋️ Pushing a crate 9 m took 720 J of work. What force was used, in newtons?
  16. 16.🏋️ A force of 420 N pushes a cart 5 m along the floor. How much work is done, in joules?
  17. 17.🏋️ A 2 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  18. 18.🏋️ A 2 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  19. 19.🏋️ A force of 320 N pushes a cart 1 m along the floor. How much work is done, in joules?
  20. 20.🏋️ Pushing a crate 9 m took 3960 J of work. What force was used, in newtons?
  21. 21.🏋️ A 19 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  22. 22.🏋️ A force of 240 N pushes a cart 6 m along the floor. How much work is done, in joules?
  23. 23.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) yes, always (d) no, work stays the same
  24. 24.🏋️ A force of 220 N did 1980 J of work. How many metres did the object move?
  25. 25.🏋️ A force of 460 N pushes a cart 10 m along the floor. How much work is done, in joules?
  26. 26.🏋️ Pushing a crate 9 m took 2070 J of work. What force was used, in newtons?
  27. 27.🏋️ A 13 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  28. 28.🏋️ A force of 90 N pushes a cart 8 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A force of 460 N did 4600 J of work. How many metres did the object move?
  30. 30.🏋️ A force of 100 N did 100 J of work. How many metres did the object move?
  31. 31.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ A force of 50 N did 100 J of work. How many metres did the object move?
  33. 33.🏋️ A force of 430 N did 3440 J of work. How many metres did the object move?
  34. 34.🏋️ A force of 500 N pushes a cart 2 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A force of 150 N did 750 J of work. How many metres did the object move?
  36. 36.🏋️ Pushing a crate 4 m took 2000 J of work. What force was used, in newtons?
  37. 37.🏋️ A force of 20 N pushes a cart 6 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 440 N pushes a cart 2 m along the floor. How much work is done, in joules?
  39. 39.🏋️ Pushing a crate 8 m took 3120 J of work. What force was used, in newtons?
  40. 40.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 5400 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. 400
  2. 750
  3. 60
  4. 470
  5. joule (J)
  6. 30
  7. 5
  8. 310
  9. through a distance
  10. 150
  11. 3600
  12. 1100
  13. 650
  14. 80
  15. 80
  16. 2100
  17. 60
  18. 20
  19. 320
  20. 440
  21. 570
  22. 1440
  23. no, work stays the same
  24. 9
  25. 4600
  26. 230
  27. 520
  28. 720
  29. 10
  30. 1
  31. 3
  32. 2
  33. 8
  34. 1000
  35. 5
  36. 500
  37. 120
  38. 880
  39. 390
  40. 900

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