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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 517 · 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.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) watt hour (d) joule (J)
  2. 2.🏋️ A 6 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 longer ramp to the same height needs … (a) more effort (b) less effort (c) the same effort (d) no effort
  4. 4.🏋️ A force of 330 N pushes a cart 6 m along the floor. How much work is done, in joules?
  5. 5.🏋️ A force of 300 N pushes a cart 4 m along the floor. How much work is done, in joules?
  6. 6.🏋️ A 2 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  7. 7.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 5000 N box up it, in newtons? (ideal ramp, no friction)
  8. 8.🏋️ A force of 70 N pushes a cart 8 m along the floor. How much work is done, in joules?
  9. 9.🏋️ Pushing a crate 4 m took 1440 J of work. What force was used, in newtons?
  10. 10.🏋️ A machine lifts a load of 240 N when you push with 120 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 3750 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A machine lifts a load of 440 N when you push with 110 N. What is its mechanical advantage (MA)?
  13. 13.🏋️ A force of 140 N pushes a cart 8 m along the floor. How much work is done, in joules?
  14. 14.🏋️ Pushing a crate 3 m took 660 J of work. What force was used, in newtons?
  15. 15.🏋️ Pushing a crate 3 m took 870 J of work. What force was used, in newtons?
  16. 16.🏋️ A force of 450 N did 2250 J of work. How many metres did the object move?
  17. 17.🏋️ A force of 340 N pushes a cart 9 m along the floor. How much work is done, in joules?
  18. 18.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load ÷ effort (c) effort ÷ load (d) load + effort
  19. 19.🏋️ A force of 440 N pushes a cart 5 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 250 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ A force of 380 N did 3040 J of work. How many metres did the object move?
  22. 22.🏋️ A force of 200 N did 1200 J of work. How many metres did the object move?
  23. 23.🏋️ A 14 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  24. 24.🏋️ Pushing a crate 9 m took 1350 J of work. What force was used, in newtons?
  25. 25.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) very slowly (d) through a distance
  26. 26.🏋️ 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?
  27. 27.🏋️ A machine lifts a load of 900 N when you push with 180 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ A force of 250 N did 1000 J of work. How many metres did the object move?
  29. 29.🏋️ A force of 120 N did 840 J of work. How many metres did the object move?
  30. 30.🏋️ A force of 80 N did 80 J of work. How many metres did the object move?
  31. 31.🏋️ A force of 80 N did 240 J of work. How many metres did the object move?
  32. 32.🏋️ An 18 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  33. 33.🏋️ A 5 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  34. 34.🏋️ A force of 10 N pushes a cart 2 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 3300 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ A machine lifts a load of 600 N when you push with 100 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A 4 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  38. 38.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) no, work stays the same (d) only on Mondays
  39. 39.🏋️ A force of 70 N pushes a cart 3 m along the floor. How much work is done, in joules?
  40. 40.🏋️ A force of 30 N did 180 J of work. How many metres did the object move?

Answer key

  1. joule (J)
  2. 180
  3. less effort
  4. 1980
  5. 1200
  6. 100
  7. 1000
  8. 560
  9. 360
  10. 2
  11. 750
  12. 4
  13. 1120
  14. 220
  15. 290
  16. 5
  17. 3060
  18. load ÷ effort
  19. 2200
  20. 50
  21. 8
  22. 6
  23. 280
  24. 150
  25. through a distance
  26. 400
  27. 5
  28. 4
  29. 7
  30. 1
  31. 3
  32. 360
  33. 250
  34. 20
  35. 550
  36. 6
  37. 200
  38. no, work stays the same
  39. 210
  40. 6

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