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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 378 · 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 3 m long and rises 1 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ A force of 390 N did 3510 J of work. How many metres did the object move?
  3. 3.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) metre (m) (d) newton (N)
  4. 4.🏋️ A machine lifts a load of 650 N when you push with 130 N. What is its mechanical advantage (MA)?
  5. 5.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) more effort (d) no effort
  6. 6.🏋️ A force of 360 N did 3600 J of work. How many metres did the object move?
  7. 7.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) no, work stays the same (c) yes, by half (d) yes, always
  8. 8.🏋️ 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?
  9. 9.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1350 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ 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)
  11. 11.🏋️ 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?
  12. 12.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 4250 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ Pushing a crate 2 m took 140 J of work. What force was used, in newtons?
  15. 15.🏋️ A 5 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  16. 16.🏋️ A force of 320 N pushes a cart 7 m along the floor. How much work is done, in joules?
  17. 17.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) load ÷ effort (d) effort ÷ load
  18. 18.🏋️ A 12 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  19. 19.🏋️ A force of 270 N did 1890 J of work. How many metres did the object move?
  20. 20.🏋️ A force of 340 N did 1700 J of work. How many metres did the object move?
  21. 21.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ A 4 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  23. 23.🏋️ A force of 380 N pushes a cart 1 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A force of 370 N did 3700 J of work. How many metres did the object move?
  25. 25.🏋️ Pushing a crate 6 m took 240 J of work. What force was used, in newtons?
  26. 26.🏋️ A machine lifts a load of 540 N when you push with 90 N. What is its mechanical advantage (MA)?
  27. 27.🏋️ A 5 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 smooth ramp is 12 m long and rises 2 m. What effort pushes a 3300 N box up it, in newtons? (ideal ramp, no friction)
  29. 29.🏋️ A force of 410 N pushes a cart 4 m along the floor. How much work is done, in joules?
  30. 30.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) very slowly (d) through a distance
  31. 31.🏋️ A machine lifts a load of 1140 N when you push with 190 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ Pushing a crate 5 m took 2450 J of work. What force was used, in newtons?
  33. 33.🏋️ A 7 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  34. 34.🏋️ A force of 380 N pushes a cart 3 m along the floor. How much work is done, in joules?
  35. 35.🏋️ An 18 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  36. 36.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ A force of 420 N did 1260 J of work. How many metres did the object move?
  38. 38.🏋️ A force of 90 N pushes a cart 9 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A force of 50 N pushes a cart 1 m along the floor. How much work is done, in joules?
  40. 40.🏋️ A machine lifts a load of 550 N when you push with 110 N. What is its mechanical advantage (MA)?

Answer key

  1. 600
  2. 9
  3. joule (J)
  4. 5
  5. less effort
  6. 10
  7. no, work stays the same
  8. 680
  9. 450
  10. 500
  11. 520
  12. 850
  13. 5
  14. 70
  15. 100
  16. 2240
  17. load ÷ effort
  18. 360
  19. 7
  20. 5
  21. 100
  22. 160
  23. 380
  24. 10
  25. 40
  26. 6
  27. 150
  28. 550
  29. 1640
  30. through a distance
  31. 6
  32. 490
  33. 140
  34. 1140
  35. 720
  36. 450
  37. 3
  38. 810
  39. 50
  40. 5

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