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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 943 · 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 3 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ 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?
  3. 3.🏋️ A force of 190 N did 1900 J of work. How many metres did the object move?
  4. 4.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) watt hour (d) joule (J)
  5. 5.🏋️ A 20 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  6. 6.🏋️ A force of 80 N pushes a cart 6 m along the floor. How much work is done, in joules?
  7. 7.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) only upwards (d) through a distance
  8. 8.🏋️ A force of 200 N did 800 J of work. How many metres did the object move?
  9. 9.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ An 11 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  11. 11.🏋️ Pushing a crate 6 m took 1140 J of work. What force was used, in newtons?
  12. 12.🏋️ A 15 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  13. 13.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load + effort (d) load ÷ effort
  14. 14.🏋️ A 3 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  15. 15.🏋️ A force of 310 N pushes a cart 4 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A 6 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  17. 17.🏋️ A force of 450 N did 1350 J of work. How many metres did the object move?
  18. 18.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) less effort (d) more effort
  19. 19.🏋️ A machine lifts a load of 600 N when you push with 150 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 250 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ Pushing a crate 2 m took 20 J of work. What force was used, in newtons?
  22. 22.🏋️ Pushing a crate 8 m took 880 J of work. What force was used, in newtons?
  23. 23.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) no, work stays the same (d) yes, always
  24. 24.🏋️ Pushing a crate 8 m took 1440 J of work. What force was used, in newtons?
  25. 25.🏋️ A force of 450 N did 4500 J of work. How many metres did the object move?
  26. 26.🏋️ A force of 180 N did 1800 J of work. How many metres did the object move?
  27. 27.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ 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?
  30. 30.🏋️ 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?
  31. 31.🏋️ A force of 10 N pushes a cart 1 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A 14 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  33. 33.🏋️ Pushing a crate 8 m took 1200 J of work. What force was used, in newtons?
  34. 34.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A 12 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  36. 36.🏋️ A force of 170 N pushes a cart 9 m along the floor. How much work is done, in joules?
  37. 37.🏋️ A force of 410 N pushes a cart 4 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 460 N did 3680 J of work. How many metres did the object move?
  39. 39.🏋️ A force of 260 N pushes a cart 6 m along the floor. How much work is done, in joules?
  40. 40.🏋️ Pushing a crate 3 m took 660 J of work. What force was used, in newtons?

Answer key

  1. 400
  2. 150
  3. 10
  4. joule (J)
  5. 400
  6. 480
  7. through a distance
  8. 4
  9. 800
  10. 220
  11. 190
  12. 450
  13. load ÷ effort
  14. 30
  15. 1240
  16. 300
  17. 3
  18. less effort
  19. 4
  20. 50
  21. 10
  22. 110
  23. no, work stays the same
  24. 180
  25. 10
  26. 10
  27. 100
  28. 2
  29. 380
  30. 180
  31. 10
  32. 700
  33. 150
  34. 2
  35. 240
  36. 1530
  37. 1640
  38. 8
  39. 1560
  40. 220

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