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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 199 · 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 270 N pushes a cart 10 m along the floor. How much work is done, in joules?
  2. 2.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ A force of 390 N did 2340 J of work. How many metres did the object move?
  4. 4.🏋️ Pushing a crate 9 m took 1440 J of work. What force was used, in newtons?
  5. 5.🏋️ A force of 170 N did 1190 J of work. How many metres did the object move?
  6. 6.🏋️ Pushing a crate 3 m took 30 J of work. What force was used, in newtons?
  7. 7.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) more effort (d) less effort
  8. 8.🏋️ Pushing a crate 3 m took 810 J of work. What force was used, in newtons?
  9. 9.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ A machine lifts a load of 40 N when you push with 10 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) through a distance (d) very slowly
  12. 12.🏋️ A 6 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  13. 13.🏋️ A 3 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  14. 14.🏋️ A machine lifts a load of 400 N when you push with 100 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ A machine lifts a load of 300 N when you push with 60 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A machine lifts a load of 120 N when you push with 30 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load ÷ effort (c) load + effort (d) effort ÷ load
  18. 18.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
  19. 19.🏋️ 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)
  20. 20.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
  21. 21.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) no, work stays the same (d) only on Mondays
  22. 22.🏋️ Pushing a crate 5 m took 200 J of work. What force was used, in newtons?
  23. 23.🏋️ A force of 350 N did 1400 J of work. How many metres did the object move?
  24. 24.🏋️ A force of 90 N pushes a cart 1 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2250 N box up it, in newtons? (ideal ramp, no friction)
  26. 26.🏋️ Pushing a crate 4 m took 1120 J of work. What force was used, in newtons?
  27. 27.🏋️ A force of 270 N pushes a cart 1 m along the floor. How much work is done, in joules?
  28. 28.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  29. 29.🏋️ A machine lifts a load of 60 N when you push with 30 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ A force of 280 N pushes a cart 3 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A force of 140 N did 840 J of work. How many metres did the object move?
  32. 32.🏋️ A machine lifts a load of 60 N when you push with 20 N. What is its mechanical advantage (MA)?
  33. 33.🏋️ A machine lifts a load of 270 N when you push with 90 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ A machine lifts a load of 160 N when you push with 40 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A force of 430 N did 1720 J of work. How many metres did the object move?
  36. 36.🏋️ A force of 110 N pushes a cart 4 m along the floor. How much work is done, in joules?
  37. 37.🏋️ A 7 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  38. 38.🏋️ A force of 310 N pushes a cart 3 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A force of 140 N did 280 J of work. How many metres did the object move?
  40. 40.🏋️ A force of 500 N pushes a cart 5 m along the floor. How much work is done, in joules?

Answer key

  1. 2700
  2. 350
  3. 6
  4. 160
  5. 7
  6. 10
  7. less effort
  8. 270
  9. 350
  10. 4
  11. through a distance
  12. 120
  13. 150
  14. 4
  15. 5
  16. 4
  17. load ÷ effort
  18. 900
  19. 300
  20. joule (J)
  21. no, work stays the same
  22. 40
  23. 4
  24. 90
  25. 750
  26. 280
  27. 270
  28. 250
  29. 2
  30. 840
  31. 6
  32. 3
  33. 3
  34. 4
  35. 4
  36. 440
  37. 280
  38. 930
  39. 2
  40. 2500

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