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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 165 · 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.🏋️ 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 9 m took 900 J of work. What force was used, in newtons?
  3. 3.🏋️ Pushing a crate 9 m took 540 J of work. What force was used, in newtons?
  4. 4.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ 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?
  6. 6.🏋️ A machine lifts a load of 180 N when you push with 90 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ Pushing a crate 2 m took 160 J of work. What force was used, in newtons?
  8. 8.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ A force of 280 N pushes a cart 8 m along the floor. How much work is done, in joules?
  10. 10.🏋️ A force of 130 N pushes a cart 1 m along the floor. How much work is done, in joules?
  11. 11.🏋️ A 4 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  12. 12.🏋️ A longer ramp to the same height needs … (a) less effort (b) more effort (c) the same effort (d) no effort
  13. 13.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 4200 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) very slowly (d) only upwards
  15. 15.🏋️ A force of 90 N pushes a cart 6 m along the floor. How much work is done, in joules?
  16. 16.🏋️ 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)
  17. 17.🏋️ A force of 10 N did 20 J of work. How many metres did the object move?
  18. 18.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1950 N box up it, in newtons? (ideal ramp, no friction)
  19. 19.🏋️ Pushing a crate 3 m took 30 J of work. What force was used, in newtons?
  20. 20.🏋️ A machine lifts a load of 390 N when you push with 130 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load ÷ effort (d) load × effort
  22. 22.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ A force of 300 N did 2700 J of work. How many metres did the object move?
  24. 24.🏋️ Pushing a crate 5 m took 2450 J of work. What force was used, in newtons?
  25. 25.🏋️ A 19 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  26. 26.🏋️ Pushing a crate 8 m took 3760 J of work. What force was used, in newtons?
  27. 27.🏋️ A force of 70 N pushes a cart 5 m along the floor. How much work is done, in joules?
  28. 28.🏋️ Pushing a crate 8 m took 3280 J of work. What force was used, in newtons?
  29. 29.🏋️ Pushing a crate 1 m took 430 J of work. What force was used, in newtons?
  30. 30.🏋️ A force of 260 N pushes a cart 9 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A force of 250 N pushes a cart 10 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  33. 33.🏋️ 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?
  34. 34.🏋️ A machine lifts a load of 480 N when you push with 120 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) watt hour (d) newton (N)
  36. 36.🏋️ Pushing a crate 1 m took 170 J of work. What force was used, in newtons?
  37. 37.🏋️ 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?
  38. 38.🏋️ An 8 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  39. 39.🏋️ A machine lifts a load of 280 N when you push with 70 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A machine lifts a load of 600 N when you push with 100 N. What is its mechanical advantage (MA)?

Answer key

  1. no, work stays the same
  2. 100
  3. 60
  4. 250
  5. 140
  6. 2
  7. 80
  8. 600
  9. 2240
  10. 130
  11. 80
  12. less effort
  13. 700
  14. through a distance
  15. 540
  16. 50
  17. 2
  18. 650
  19. 10
  20. 3
  21. load ÷ effort
  22. 1000
  23. 9
  24. 490
  25. 190
  26. 470
  27. 350
  28. 410
  29. 430
  30. 2340
  31. 2500
  32. 400
  33. 220
  34. 4
  35. joule (J)
  36. 170
  37. 10
  38. 400
  39. 4
  40. 6

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