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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 591 · 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 force of 480 N pushes a cart 6 m along the floor. How much work is done, in joules?
  2. 2.🏋️ A force of 150 N pushes a cart 2 m along the floor. How much work is done, in joules?
  3. 3.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) without moving it (d) only upwards
  4. 4.🏋️ A 1 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  5. 5.🏋️ Pushing a crate 7 m took 3290 J of work. What force was used, in newtons?
  6. 6.🏋️ A machine lifts a load of 510 N when you push with 170 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ A force of 180 N did 1440 J of work. How many metres did the object move?
  9. 9.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) watt hour (d) metre (m)
  10. 10.🏋️ Pushing a crate 3 m took 120 J of work. What force was used, in newtons?
  11. 11.🏋️ A machine lifts a load of 80 N when you push with 20 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ A force of 120 N did 1080 J of work. How many metres did the object move?
  13. 13.🏋️ A force of 50 N pushes a cart 7 m along the floor. How much work is done, in joules?
  14. 14.🏋️ 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?
  15. 15.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  16. 16.🏋️ A machine lifts a load of 480 N when you push with 160 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ 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?
  18. 18.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) only on Mondays (d) yes, by half
  19. 19.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) no effort (d) less effort
  20. 20.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1700 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ Pushing a crate 3 m took 600 J of work. What force was used, in newtons?
  24. 24.🏋️ A 17 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  25. 25.🏋️ A force of 300 N did 1800 J of work. How many metres did the object move?
  26. 26.🏋️ A 12 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ A force of 290 N did 1740 J of work. How many metres did the object move?
  28. 28.🏋️ Pushing a crate 1 m took 220 J of work. What force was used, in newtons?
  29. 29.🏋️ A force of 290 N pushes a cart 5 m along the floor. How much work is done, in joules?
  30. 30.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ 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?
  32. 32.🏋️ A force of 90 N pushes a cart 3 m along the floor. How much work is done, in joules?
  33. 33.🏋️ A machine lifts a load of 320 N when you push with 80 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ A force of 180 N did 540 J of work. How many metres did the object move?
  35. 35.🏋️ 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?
  36. 36.🏋️ Pushing a crate 2 m took 120 J of work. What force was used, in newtons?
  37. 37.🏋️ A force of 480 N did 3360 J of work. How many metres did the object move?
  38. 38.🏋️ Pushing a crate 8 m took 3920 J of work. What force was used, in newtons?
  39. 39.🏋️ Pushing a crate 9 m took 4320 J of work. What force was used, in newtons?
  40. 40.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load + effort (d) load ÷ effort

Answer key

  1. 2880
  2. 300
  3. through a distance
  4. 40
  5. 470
  6. 3
  7. 2
  8. 8
  9. joule (J)
  10. 40
  11. 4
  12. 9
  13. 350
  14. 450
  15. 900
  16. 3
  17. 520
  18. no, work stays the same
  19. less effort
  20. 150
  21. 850
  22. 3
  23. 200
  24. 680
  25. 6
  26. 120
  27. 6
  28. 220
  29. 1450
  30. 250
  31. 180
  32. 270
  33. 4
  34. 3
  35. 100
  36. 60
  37. 7
  38. 490
  39. 480
  40. load ÷ effort

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