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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 657 · 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 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?
  2. 2.🏋️ A force of 20 N pushes a cart 5 m along the floor. How much work is done, in joules?
  3. 3.🏋️ A force of 250 N pushes a cart 3 m along the floor. How much work is done, in joules?
  4. 4.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ Pushing a crate 2 m took 20 J of work. What force was used, in newtons?
  6. 6.🏋️ A force of 440 N did 3080 J of work. How many metres did the object move?
  7. 7.🏋️ Pushing a crate 6 m took 180 J of work. What force was used, in newtons?
  8. 8.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ A force of 110 N did 220 J of work. How many metres did the object move?
  10. 10.🏋️ A 9 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  11. 11.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load + effort (d) load × effort
  13. 13.🏋️ A machine lifts a load of 150 N when you push with 30 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) through a distance (d) very slowly
  15. 15.🏋️ A machine lifts a load of 450 N when you push with 150 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A force of 270 N pushes a cart 2 m along the floor. How much work is done, in joules?
  17. 17.🏋️ A force of 250 N did 1250 J of work. How many metres did the object move?
  18. 18.🏋️ A force of 310 N did 930 J of work. How many metres did the object move?
  19. 19.🏋️ Pushing a crate 4 m took 520 J of work. What force was used, in newtons?
  20. 20.🏋️ Pushing a crate 6 m took 1620 J of work. What force was used, in newtons?
  21. 21.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) only on Mondays (d) no, work stays the same
  22. 22.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ A longer ramp to the same height needs … (a) no effort (b) less effort (c) more effort (d) the same effort
  24. 24.🏋️ Pushing a crate 8 m took 3600 J of work. What force was used, in newtons?
  25. 25.🏋️ Pushing a crate 7 m took 3430 J of work. What force was used, in newtons?
  26. 26.🏋️ A force of 310 N did 2170 J of work. How many metres did the object move?
  27. 27.🏋️ A force of 50 N pushes a cart 6 m along the floor. How much work is done, in joules?
  28. 28.🏋️ Pushing a crate 6 m took 300 J of work. What force was used, in newtons?
  29. 29.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) joule (J) (d) newton (N)
  30. 30.🏋️ A force of 280 N pushes a cart 10 m along the floor. How much work is done, in joules?
  31. 31.🏋️ 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?
  32. 32.🏋️ Pushing a crate 4 m took 680 J of work. What force was used, in newtons?
  33. 33.🏋️ 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)
  34. 34.🏋️ A force of 400 N pushes a cart 1 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A 9 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  36. 36.🏋️ A machine lifts a load of 780 N when you push with 130 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ Pushing a crate 6 m took 3000 J of work. What force was used, in newtons?
  38. 38.🏋️ A force of 200 N did 400 J of work. How many metres did the object move?
  39. 39.🏋️ A 13 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ A force of 20 N pushes a cart 8 m along the floor. How much work is done, in joules?

Answer key

  1. 210
  2. 100
  3. 750
  4. 500
  5. 10
  6. 7
  7. 30
  8. 800
  9. 2
  10. 180
  11. 100
  12. load ÷ effort
  13. 5
  14. through a distance
  15. 3
  16. 540
  17. 5
  18. 3
  19. 130
  20. 270
  21. no, work stays the same
  22. 3
  23. less effort
  24. 450
  25. 490
  26. 7
  27. 300
  28. 50
  29. joule (J)
  30. 2800
  31. 570
  32. 170
  33. 500
  34. 400
  35. 450
  36. 6
  37. 500
  38. 2
  39. 650
  40. 160

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