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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 927 · 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 4 m long and rises 1 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) without moving it (d) very slowly
  3. 3.🏋️ A 20 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  4. 4.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ Pushing a crate 2 m took 1000 J of work. What force was used, in newtons?
  6. 6.🏋️ A 13 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  7. 7.🏋️ A longer ramp to the same height needs … (a) more effort (b) less effort (c) no effort (d) the same effort
  8. 8.🏋️ Pushing a crate 6 m took 420 J of work. What force was used, in newtons?
  9. 9.🏋️ A machine lifts a load of 330 N when you push with 110 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ Pushing a crate 6 m took 2040 J of work. What force was used, in newtons?
  11. 11.🏋️ A force of 340 N did 2380 J of work. How many metres did the object move?
  12. 12.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1950 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ A force of 20 N did 120 J of work. How many metres did the object move?
  14. 14.🏋️ A machine lifts a load of 720 N when you push with 120 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ A force of 30 N pushes a cart 2 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A 15 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  17. 17.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) no, work stays the same (d) yes, by half
  18. 18.🏋️ A machine lifts a load of 240 N when you push with 40 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A force of 460 N pushes a cart 1 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 100 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) joule (J) (d) metre (m)
  22. 22.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ A force of 120 N did 120 J of work. How many metres did the object move?
  24. 24.🏋️ 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?
  25. 25.🏋️ A force of 250 N pushes a cart 10 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A force of 500 N did 3000 J of work. How many metres did the object move?
  27. 27.🏋️ A force of 380 N did 760 J of work. How many metres did the object move?
  28. 28.🏋️ A 10 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  29. 29.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 2200 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ Pushing a crate 7 m took 770 J of work. What force was used, in newtons?
  31. 31.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ A 15 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  33. 33.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2850 N box up it, in newtons? (ideal ramp, no friction)
  34. 34.🏋️ Pushing a crate 7 m took 3080 J of work. What force was used, in newtons?
  35. 35.🏋️ A machine lifts a load of 400 N when you push with 80 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ A force of 50 N pushes a cart 9 m along the floor. How much work is done, in joules?
  37. 37.🏋️ A machine lifts a load of 30 N when you push with 10 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ Pushing a crate 4 m took 120 J of work. What force was used, in newtons?
  39. 39.🏋️ A force of 150 N pushes a cart 3 m along the floor. How much work is done, in joules?
  40. 40.🏋️ A 9 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. 100
  2. through a distance
  3. 200
  4. 150
  5. 500
  6. 520
  7. less effort
  8. 70
  9. 3
  10. 340
  11. 7
  12. 650
  13. 6
  14. 6
  15. 60
  16. 300
  17. no, work stays the same
  18. 6
  19. 460
  20. 50
  21. joule (J)
  22. 100
  23. 1
  24. 400
  25. 2500
  26. 6
  27. 2
  28. 300
  29. 550
  30. 110
  31. 450
  32. 150
  33. 950
  34. 440
  35. 5
  36. 450
  37. 3
  38. 30
  39. 450
  40. 180

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