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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 37 · 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.

NameDateTime takenScore ___ / 40
  1. 1.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, always (c) only on Mondays (d) yes, by half
  2. 2.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ A machine lifts a load of 280 N when you push with 70 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
  5. 5.🏋️ Pushing a crate 9 m took 270 J of work. What force was used, in newtons?
  6. 6.🏋️ A force of 100 N pushes a cart 9 m along the floor. How much work is done, in joules?
  7. 7.🏋️ A force of 170 N did 850 J of work. How many metres did the object move?
  8. 8.🏋️ A machine lifts a load of 160 N when you push with 80 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ Work is done when a force moves something … (a) through a distance (b) only upwards (c) very slowly (d) without moving it
  10. 10.🏋️ 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?
  11. 11.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A force of 40 N did 160 J of work. How many metres did the object move?
  13. 13.🏋️ 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?
  14. 14.🏋️ A force of 280 N did 2800 J of work. How many metres did the object move?
  15. 15.🏋️ A force of 290 N did 2900 J of work. How many metres did the object move?
  16. 16.🏋️ A machine lifts a load of 780 N when you push with 130 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ A force of 170 N pushes a cart 4 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A force of 170 N did 1360 J of work. How many metres did the object move?
  19. 19.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) no effort (d) more effort
  20. 20.🏋️ Pushing a crate 3 m took 810 J of work. What force was used, in newtons?
  21. 21.🏋️ A force of 80 N did 800 J of work. How many metres did the object move?
  22. 22.🏋️ A force of 390 N pushes a cart 6 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A force of 40 N pushes a cart 10 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 100 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
  26. 26.🏋️ A force of 200 N pushes a cart 6 m along the floor. How much work is done, in joules?
  27. 27.🏋️ A machine lifts a load of 420 N when you push with 140 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ A force of 310 N did 310 J of work. How many metres did the object move?
  29. 29.🏋️ A force of 290 N did 2030 J of work. How many metres did the object move?
  30. 30.🏋️ Pushing a crate 3 m took 120 J of work. What force was used, in newtons?
  31. 31.🏋️ A 14 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  32. 32.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) joule (J) (d) metre (m)
  33. 33.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  34. 34.🏋️ A force of 60 N did 300 J of work. How many metres did the object move?
  35. 35.🏋️ A force of 370 N pushes a cart 8 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A 13 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  37. 37.🏋️ A machine lifts a load of 120 N when you push with 60 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ A 16 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 force of 140 N did 280 J of work. How many metres did the object move?
  40. 40.🏋️ A force of 90 N pushes a cart 5 m along the floor. How much work is done, in joules?

Answer key

  1. no, work stays the same
  2. 400
  3. 4
  4. load ÷ effort
  5. 30
  6. 900
  7. 5
  8. 2
  9. through a distance
  10. 130
  11. 700
  12. 4
  13. 250
  14. 10
  15. 10
  16. 6
  17. 680
  18. 8
  19. less effort
  20. 270
  21. 10
  22. 2340
  23. 400
  24. 50
  25. 400
  26. 1200
  27. 3
  28. 1
  29. 7
  30. 40
  31. 140
  32. joule (J)
  33. 400
  34. 5
  35. 2960
  36. 390
  37. 2
  38. 640
  39. 2
  40. 450

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