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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 978 · 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 12 m long and rises 3 m. What effort pushes a 2200 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ Pushing a crate 8 m took 3120 J of work. What force was used, in newtons?
  3. 3.🏋️ Pushing a crate 9 m took 2160 J of work. What force was used, in newtons?
  4. 4.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
  5. 5.🏋️ A force of 40 N did 320 J of work. How many metres did the object move?
  6. 6.🏋️ A force of 470 N did 2350 J of work. How many metres did the object move?
  7. 7.🏋️ A machine lifts a load of 850 N when you push with 170 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ A 1 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  9. 9.🏋️ Pushing a crate 1 m took 20 J of work. What force was used, in newtons?
  10. 10.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) the same effort (d) less effort
  12. 12.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load ÷ effort (c) load + effort (d) effort ÷ load
  14. 14.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) no, work stays the same (d) only on Mondays
  15. 15.🏋️ A force of 210 N pushes a cart 5 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A force of 60 N pushes a cart 7 m along the floor. How much work is done, in joules?
  17. 17.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 6000 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) metre (m) (d) newton (N)
  19. 19.🏋️ Pushing a crate 2 m took 700 J of work. What force was used, in newtons?
  20. 20.🏋️ A force of 330 N did 660 J of work. How many metres did the object move?
  21. 21.🏋️ Pushing a crate 2 m took 140 J of work. What force was used, in newtons?
  22. 22.🏋️ A force of 230 N did 2070 J of work. How many metres did the object move?
  23. 23.🏋️ A force of 280 N did 1960 J of work. How many metres did the object move?
  24. 24.🏋️ Pushing a crate 10 m took 1600 J of work. What force was used, in newtons?
  25. 25.🏋️ A force of 250 N did 500 J of work. How many metres did the object move?
  26. 26.🏋️ A force of 370 N pushes a cart 1 m along the floor. How much work is done, in joules?
  27. 27.🏋️ A force of 50 N did 300 J of work. How many metres did the object move?
  28. 28.🏋️ A force of 260 N pushes a cart 1 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A force of 30 N did 60 J of work. How many metres did the object move?
  30. 30.🏋️ A force of 470 N did 3760 J of work. How many metres did the object move?
  31. 31.🏋️ A force of 70 N did 280 J of work. How many metres did the object move?
  32. 32.🏋️ A force of 20 N did 140 J of work. How many metres did the object move?
  33. 33.🏋️ A force of 130 N pushes a cart 2 m along the floor. How much work is done, in joules?
  34. 34.🏋️ Pushing a crate 4 m took 1040 J of work. What force was used, in newtons?
  35. 35.🏋️ A force of 50 N pushes a cart 8 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A machine lifts a load of 160 N when you push with 40 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A force of 240 N pushes a cart 9 m along the floor. How much work is done, in joules?
  38. 38.🏋️ Pushing a crate 5 m took 1550 J of work. What force was used, in newtons?
  39. 39.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
  40. 40.🏋️ A force of 490 N did 3430 J of work. How many metres did the object move?

Answer key

  1. 550
  2. 390
  3. 240
  4. through a distance
  5. 8
  6. 5
  7. 5
  8. 50
  9. 20
  10. 2
  11. less effort
  12. 350
  13. load ÷ effort
  14. no, work stays the same
  15. 1050
  16. 420
  17. 1000
  18. joule (J)
  19. 350
  20. 2
  21. 70
  22. 9
  23. 7
  24. 160
  25. 2
  26. 370
  27. 6
  28. 260
  29. 2
  30. 8
  31. 4
  32. 7
  33. 260
  34. 260
  35. 400
  36. 4
  37. 2160
  38. 310
  39. 350
  40. 7

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