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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 265 · 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 6 m long and rises 2 m. What effort pushes a 1050 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ Pushing a crate 5 m took 2500 J of work. What force was used, in newtons?
  3. 3.🏋️ A force of 10 N pushes a cart 6 m along the floor. How much work is done, in joules?
  4. 4.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ A machine lifts a load of 320 N when you push with 80 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) only upwards (d) without moving it
  7. 7.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, by half (c) yes, always (d) only on Mondays
  8. 8.🏋️ A force of 370 N did 2590 J of work. How many metres did the object move?
  9. 9.🏋️ A force of 330 N did 1320 J of work. How many metres did the object move?
  10. 10.🏋️ A machine lifts a load of 650 N when you push with 130 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ A force of 190 N did 950 J of work. How many metres did the object move?
  12. 12.🏋️ A force of 260 N pushes a cart 4 m along the floor. How much work is done, in joules?
  13. 13.🏋️ Pushing a crate 4 m took 440 J of work. What force was used, in newtons?
  14. 14.🏋️ Pushing a crate 2 m took 840 J of work. What force was used, in newtons?
  15. 15.🏋️ A 4 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  16. 16.🏋️ A 2 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  17. 17.🏋️ A 10 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  18. 18.🏋️ A 15 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  19. 19.🏋️ 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)
  20. 20.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) more effort (d) less effort
  22. 22.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load × effort (d) load + effort
  23. 23.🏋️ Pushing a crate 2 m took 100 J of work. What force was used, in newtons?
  24. 24.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) joule (J) (d) newton (N)
  25. 25.🏋️ A force of 300 N pushes a cart 3 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A force of 430 N pushes a cart 3 m along the floor. How much work is done, in joules?
  27. 27.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2550 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ 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?
  29. 29.🏋️ Pushing a crate 7 m took 1050 J of work. What force was used, in newtons?
  30. 30.🏋️ A force of 160 N pushes a cart 7 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ A 2 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  33. 33.🏋️ A force of 80 N pushes a cart 3 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A force of 480 N did 3360 J of work. How many metres did the object move?
  35. 35.🏋️ 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?
  36. 36.🏋️ 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)
  37. 37.🏋️ A 16 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  38. 38.🏋️ Pushing a crate 4 m took 760 J of work. What force was used, in newtons?
  39. 39.🏋️ A 14 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ A machine lifts a load of 240 N when you push with 120 N. What is its mechanical advantage (MA)?

Answer key

  1. 350
  2. 500
  3. 60
  4. 100
  5. 4
  6. through a distance
  7. no, work stays the same
  8. 7
  9. 4
  10. 5
  11. 5
  12. 1040
  13. 110
  14. 420
  15. 40
  16. 20
  17. 200
  18. 750
  19. 600
  20. 2
  21. less effort
  22. load ÷ effort
  23. 50
  24. joule (J)
  25. 900
  26. 1290
  27. 850
  28. 100
  29. 150
  30. 1120
  31. 600
  32. 60
  33. 240
  34. 7
  35. 50
  36. 450
  37. 320
  38. 190
  39. 560
  40. 2

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