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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 784 · 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 machine lifts a load of 800 N when you push with 200 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) metre (m) (d) newton (N)
  3. 3.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
  4. 4.🏋️ 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?
  5. 5.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) no effort (d) more effort
  6. 6.🏋️ A 1 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  7. 7.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) without moving it (d) only upwards
  8. 8.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) only on Mondays (d) no, work stays the same
  9. 9.🏋️ A machine lifts a load of 120 N when you push with 60 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ A force of 170 N did 1360 J of work. How many metres did the object move?
  11. 11.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load ÷ effort (d) load + effort
  12. 12.🏋️ An 11 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  13. 13.🏋️ 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?
  14. 14.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 5100 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ A machine lifts a load of 40 N when you push with 10 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A force of 390 N pushes a cart 3 m along the floor. How much work is done, in joules?
  17. 17.🏋️ A machine lifts a load of 330 N when you push with 110 N. What is its mechanical advantage (MA)?
  18. 18.🏋️ Pushing a crate 10 m took 2600 J of work. What force was used, in newtons?
  19. 19.🏋️ A force of 270 N pushes a cart 6 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 5100 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ Pushing a crate 10 m took 2300 J of work. What force was used, in newtons?
  23. 23.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3250 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ A force of 150 N pushes a cart 4 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ Pushing a crate 5 m took 2150 J of work. What force was used, in newtons?
  28. 28.🏋️ A machine lifts a load of 30 N when you push with 10 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1650 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ A force of 370 N did 3330 J of work. How many metres did the object move?
  31. 31.🏋️ A machine lifts a load of 1200 N when you push with 200 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ A force of 340 N pushes a cart 1 m along the floor. How much work is done, in joules?
  33. 33.🏋️ A machine lifts a load of 680 N when you push with 170 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ A force of 420 N did 3360 J of work. How many metres did the object move?
  35. 35.🏋️ Pushing a crate 3 m took 1020 J of work. What force was used, in newtons?
  36. 36.🏋️ A force of 450 N pushes a cart 7 m along the floor. How much work is done, in joules?
  37. 37.🏋️ 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?
  38. 38.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ A force of 490 N pushes a cart 5 m along the floor. How much work is done, in joules?
  40. 40.🏋️ An 18 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. 4
  2. joule (J)
  3. 200
  4. 150
  5. less effort
  6. 20
  7. through a distance
  8. no, work stays the same
  9. 2
  10. 8
  11. load ÷ effort
  12. 330
  13. 250
  14. 850
  15. 4
  16. 1170
  17. 3
  18. 260
  19. 1620
  20. 400
  21. 850
  22. 230
  23. 500
  24. 650
  25. 600
  26. 1000
  27. 430
  28. 3
  29. 550
  30. 9
  31. 6
  32. 340
  33. 4
  34. 8
  35. 340
  36. 3150
  37. 150
  38. 600
  39. 2450
  40. 900

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