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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 425 · 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 longer ramp to the same height needs … (a) more effort (b) less effort (c) no effort (d) the same effort
  2. 2.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) without moving it (d) very slowly
  3. 3.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) watt hour (d) newton (N)
  4. 4.🏋️ A force of 320 N did 960 J of work. How many metres did the object move?
  5. 5.🏋️ 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?
  6. 6.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ A machine lifts a load of 700 N when you push with 140 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ A 3 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  9. 9.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ Pushing a crate 7 m took 2450 J of work. What force was used, in newtons?
  11. 11.🏋️ A machine lifts a load of 510 N when you push with 170 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) only on Mondays (d) no, work stays the same
  13. 13.🏋️ A machine lifts a load of 80 N when you push with 20 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ A force of 450 N pushes a cart 8 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A machine lifts a load of 720 N when you push with 180 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ Pushing a crate 6 m took 2940 J of work. What force was used, in newtons?
  17. 17.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load + effort (d) load ÷ effort
  18. 18.🏋️ A force of 260 N did 2080 J of work. How many metres did the object move?
  19. 19.🏋️ A machine lifts a load of 420 N when you push with 70 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ A machine lifts a load of 680 N when you push with 170 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ A machine lifts a load of 160 N when you push with 40 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ A force of 210 N did 1050 J of work. How many metres did the object move?
  24. 24.🏋️ A force of 400 N did 1600 J of work. How many metres did the object move?
  25. 25.🏋️ A machine lifts a load of 180 N when you push with 60 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A force of 340 N did 3400 J of work. How many metres did the object move?
  27. 27.🏋️ An 11 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  28. 28.🏋️ 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?
  29. 29.🏋️ 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?
  30. 30.🏋️ A force of 310 N pushes a cart 10 m along the floor. How much work is done, in joules?
  31. 31.🏋️ Pushing a crate 6 m took 1080 J of work. What force was used, in newtons?
  32. 32.🏋️ A force of 10 N did 100 J of work. How many metres did the object move?
  33. 33.🏋️ A force of 110 N pushes a cart 1 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 5100 N box up it, in newtons? (ideal ramp, no friction)
  35. 35.🏋️ A machine lifts a load of 240 N when you push with 80 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ A 20 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  37. 37.🏋️ A 10 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  38. 38.🏋️ Pushing a crate 8 m took 560 J of work. What force was used, in newtons?
  39. 39.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  40. 40.🏋️ A 17 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. less effort
  2. through a distance
  3. joule (J)
  4. 3
  5. 950
  6. 2
  7. 5
  8. 90
  9. 600
  10. 350
  11. 3
  12. no, work stays the same
  13. 4
  14. 3600
  15. 4
  16. 490
  17. load ÷ effort
  18. 8
  19. 6
  20. 4
  21. 4
  22. 250
  23. 5
  24. 4
  25. 3
  26. 10
  27. 330
  28. 570
  29. 400
  30. 3100
  31. 180
  32. 10
  33. 110
  34. 850
  35. 3
  36. 400
  37. 100
  38. 70
  39. 450
  40. 510

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