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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 981 · 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 8 m long and rises 2 m. What effort pushes a 3200 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) metre (m) (d) watt hour
  4. 4.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load + effort (d) load × effort
  5. 5.🏋️ A force of 340 N did 3400 J of work. How many metres did the object move?
  6. 6.🏋️ A machine lifts a load of 400 N when you push with 100 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  8. 8.🏋️ A force of 30 N pushes a cart 5 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) the same effort (d) less effort
  10. 10.🏋️ A machine lifts a load of 20 N when you push with 10 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ 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?
  12. 12.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) without moving it (d) through a distance
  13. 13.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ Pushing a crate 5 m took 2150 J of work. What force was used, in newtons?
  16. 16.🏋️ 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)
  17. 17.🏋️ A force of 420 N pushes a cart 3 m along the floor. How much work is done, in joules?
  18. 18.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) yes, by half (d) no, work stays the same
  19. 19.🏋️ A machine lifts a load of 300 N when you push with 50 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ A force of 270 N pushes a cart 6 m along the floor. How much work is done, in joules?
  21. 21.🏋️ An 18 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  22. 22.🏋️ A force of 20 N pushes a cart 1 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ A force of 260 N pushes a cart 5 m along the floor. How much work is done, in joules?
  26. 26.🏋️ Pushing a crate 10 m took 4900 J of work. What force was used, in newtons?
  27. 27.🏋️ A force of 20 N pushes a cart 3 m along the floor. How much work is done, in joules?
  28. 28.🏋️ Pushing a crate 9 m took 1170 J of work. What force was used, in newtons?
  29. 29.🏋️ 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?
  30. 30.🏋️ A machine lifts a load of 700 N when you push with 140 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1050 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ A 9 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 force of 220 N did 1760 J of work. How many metres did the object move?
  34. 34.🏋️ A force of 130 N did 130 J of work. How many metres did the object move?
  35. 35.🏋️ A force of 300 N pushes a cart 10 m along the floor. How much work is done, in joules?
  36. 36.🏋️ 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)
  37. 37.🏋️ Pushing a crate 8 m took 800 J of work. What force was used, in newtons?
  38. 38.🏋️ A force of 330 N did 660 J of work. How many metres did the object move?
  39. 39.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3500 N box up it, in newtons? (ideal ramp, no friction)
  40. 40.🏋️ 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?

Answer key

  1. 800
  2. 100
  3. joule (J)
  4. load ÷ effort
  5. 10
  6. 4
  7. 300
  8. 150
  9. less effort
  10. 2
  11. 380
  12. through a distance
  13. 400
  14. 400
  15. 430
  16. 100
  17. 1260
  18. no, work stays the same
  19. 6
  20. 1620
  21. 540
  22. 20
  23. 200
  24. 3
  25. 1300
  26. 490
  27. 60
  28. 130
  29. 150
  30. 5
  31. 350
  32. 90
  33. 8
  34. 1
  35. 3000
  36. 50
  37. 100
  38. 2
  39. 700
  40. 250

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