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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 392 · 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 120 N pushes a cart 7 m along the floor. How much work is done, in joules?
  2. 2.🏋️ A force of 10 N did 10 J of work. How many metres did the object move?
  3. 3.🏋️ A force of 150 N did 1200 J of work. How many metres did the object move?
  4. 4.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) yes, by half (d) no, work stays the same
  5. 5.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
  6. 6.🏋️ 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?
  7. 7.🏋️ A 13 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  8. 8.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) metre (m) (d) watt hour
  9. 9.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ Pushing a crate 7 m took 280 J of work. What force was used, in newtons?
  11. 11.🏋️ A force of 130 N pushes a cart 4 m along the floor. How much work is done, in joules?
  12. 12.🏋️ A 1 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  13. 13.🏋️ Pushing a crate 7 m took 770 J of work. What force was used, in newtons?
  14. 14.🏋️ A 19 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  15. 15.🏋️ 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)
  16. 16.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load × effort (d) load + effort
  17. 17.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ A machine lifts a load of 240 N when you push with 80 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A force of 140 N pushes a cart 7 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A force of 140 N pushes a cart 3 m along the floor. How much work is done, in joules?
  21. 21.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ Pushing a crate 4 m took 1840 J of work. What force was used, in newtons?
  23. 23.🏋️ A force of 380 N pushes a cart 8 m along the floor. How much work is done, in joules?
  24. 24.🏋️ Pushing a crate 7 m took 2520 J of work. What force was used, in newtons?
  25. 25.🏋️ Pushing a crate 10 m took 2500 J of work. What force was used, in newtons?
  26. 26.🏋️ A force of 410 N pushes a cart 10 m along the floor. How much work is done, in joules?
  27. 27.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) more effort (d) less effort
  28. 28.🏋️ 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?
  29. 29.🏋️ A machine lifts a load of 440 N when you push with 110 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ A force of 50 N pushes a cart 2 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A force of 480 N did 4320 J of work. How many metres did the object move?
  33. 33.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ A force of 290 N pushes a cart 7 m along the floor. How much work is done, in joules?
  35. 35.🏋️ Pushing a crate 1 m took 370 J of work. What force was used, in newtons?
  36. 36.🏋️ A force of 490 N pushes a cart 2 m along the floor. How much work is done, in joules?
  37. 37.🏋️ A force of 250 N did 1750 J of work. How many metres did the object move?
  38. 38.🏋️ A machine lifts a load of 1140 N when you push with 190 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2550 N box up it, in newtons? (ideal ramp, no friction)
  40. 40.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. 840
  2. 1
  3. 8
  4. no, work stays the same
  5. through a distance
  6. 330
  7. 650
  8. joule (J)
  9. 150
  10. 40
  11. 520
  12. 10
  13. 110
  14. 380
  15. 150
  16. load ÷ effort
  17. 300
  18. 3
  19. 980
  20. 420
  21. 500
  22. 460
  23. 3040
  24. 360
  25. 250
  26. 4100
  27. less effort
  28. 440
  29. 4
  30. 2
  31. 100
  32. 9
  33. 2
  34. 2030
  35. 370
  36. 980
  37. 7
  38. 6
  39. 850
  40. 100

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