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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 320 · 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.🏋️ 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?
  2. 2.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) very slowly (d) through a distance
  3. 3.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  4. 4.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) newton (N) (d) metre (m)
  5. 5.🏋️ A 1 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  6. 6.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  7. 7.🏋️ An 11 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  8. 8.🏋️ A machine lifts a load of 160 N when you push with 40 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ A force of 380 N did 1520 J of work. How many metres did the object move?
  10. 10.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load ÷ effort (c) load + effort (d) effort ÷ load
  13. 13.🏋️ A force of 410 N did 2050 J of work. How many metres did the object move?
  14. 14.🏋️ A force of 160 N did 160 J of work. How many metres did the object move?
  15. 15.🏋️ A force of 260 N pushes a cart 4 m along the floor. How much work is done, in joules?
  16. 16.🏋️ An 11 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  17. 17.🏋️ Pushing a crate 9 m took 180 J of work. What force was used, in newtons?
  18. 18.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) more effort (d) no effort
  19. 19.🏋️ A machine lifts a load of 360 N when you push with 90 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ A force of 390 N did 2730 J of work. How many metres did the object move?
  21. 21.🏋️ A force of 500 N did 1500 J of work. How many metres did the object move?
  22. 22.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) yes, by half (d) only on Mondays
  23. 23.🏋️ A force of 150 N did 600 J of work. How many metres did the object move?
  24. 24.🏋️ A 13 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  25. 25.🏋️ 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?
  26. 26.🏋️ A force of 150 N did 300 J of work. How many metres did the object move?
  27. 27.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 2800 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ Pushing a crate 8 m took 1120 J of work. What force was used, in newtons?
  29. 29.🏋️ A force of 130 N did 130 J of work. How many metres did the object move?
  30. 30.🏋️ A force of 370 N pushes a cart 8 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A machine lifts a load of 120 N when you push with 20 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ 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?
  33. 33.🏋️ A force of 120 N pushes a cart 2 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A machine lifts a load of 150 N when you push with 30 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2550 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ Pushing a crate 1 m took 180 J of work. What force was used, in newtons?
  37. 37.🏋️ A 20 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  38. 38.🏋️ A machine lifts a load of 40 N when you push with 20 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ A machine lifts a load of 180 N when you push with 30 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A force of 450 N pushes a cart 7 m along the floor. How much work is done, in joules?

Answer key

  1. 400
  2. through a distance
  3. 600
  4. joule (J)
  5. 10
  6. 300
  7. 220
  8. 4
  9. 4
  10. 900
  11. 2
  12. load ÷ effort
  13. 5
  14. 1
  15. 1040
  16. 110
  17. 20
  18. less effort
  19. 4
  20. 7
  21. 3
  22. no, work stays the same
  23. 4
  24. 130
  25. 150
  26. 2
  27. 700
  28. 140
  29. 1
  30. 2960
  31. 6
  32. 200
  33. 240
  34. 5
  35. 850
  36. 180
  37. 400
  38. 2
  39. 6
  40. 3150

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