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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 351 · 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) yes, by half (b) no, work stays the same (c) yes, always (d) only on Mondays
  2. 2.🏋️ Pushing a crate 7 m took 980 J of work. What force was used, in newtons?
  3. 3.🏋️ A force of 460 N pushes a cart 3 m along the floor. How much work is done, in joules?
  4. 4.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ A machine lifts a load of 40 N when you push with 10 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ A machine lifts a load of 240 N when you push with 120 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load ÷ effort (d) load × effort
  8. 8.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ A force of 70 N pushes a cart 10 m along the floor. How much work is done, in joules?
  10. 10.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ A force of 470 N pushes a cart 3 m along the floor. How much work is done, in joules?
  12. 12.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) very slowly (d) through a distance
  13. 13.🏋️ A force of 240 N pushes a cart 9 m along the floor. How much work is done, in joules?
  14. 14.🏋️ An 11 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  15. 15.🏋️ A 10 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  16. 16.🏋️ A force of 170 N pushes a cart 10 m along the floor. How much work is done, in joules?
  17. 17.🏋️ A force of 120 N did 840 J of work. How many metres did the object move?
  18. 18.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  19. 19.🏋️ A force of 320 N pushes a cart 7 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A 9 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  21. 21.🏋️ Pushing a crate 2 m took 220 J of work. What force was used, in newtons?
  22. 22.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ A force of 260 N did 2600 J of work. How many metres did the object move?
  24. 24.🏋️ A force of 80 N pushes a cart 1 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) more effort (d) no effort
  26. 26.🏋️ An 11 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ A force of 290 N did 1160 J of work. How many metres did the object move?
  28. 28.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 3500 N box up it, in newtons? (ideal ramp, no friction)
  29. 29.🏋️ 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?
  30. 30.🏋️ Pushing a crate 9 m took 2340 J of work. What force was used, in newtons?
  31. 31.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) metre (m) (d) watt hour
  32. 32.🏋️ A force of 500 N did 3500 J of work. How many metres did the object move?
  33. 33.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 2500 N box up it, in newtons? (ideal ramp, no friction)
  34. 34.🏋️ A 3 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  35. 35.🏋️ A force of 240 N did 720 J of work. How many metres did the object move?
  36. 36.🏋️ A force of 470 N did 4700 J of work. How many metres did the object move?
  37. 37.🏋️ Pushing a crate 9 m took 450 J of work. What force was used, in newtons?
  38. 38.🏋️ An 18 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  39. 39.🏋️ A 17 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ A machine lifts a load of 90 N when you push with 30 N. What is its mechanical advantage (MA)?

Answer key

  1. no, work stays the same
  2. 140
  3. 1380
  4. 600
  5. 4
  6. 2
  7. load ÷ effort
  8. 150
  9. 700
  10. 5
  11. 1410
  12. through a distance
  13. 2160
  14. 330
  15. 300
  16. 1700
  17. 7
  18. 250
  19. 2240
  20. 270
  21. 110
  22. 2
  23. 10
  24. 80
  25. less effort
  26. 440
  27. 4
  28. 700
  29. 180
  30. 260
  31. joule (J)
  32. 7
  33. 500
  34. 60
  35. 3
  36. 10
  37. 50
  38. 180
  39. 170
  40. 3

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