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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 703 · 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.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) very slowly (d) without moving it
  2. 2.🏋️ A force of 100 N pushes a cart 5 m along the floor. How much work is done, in joules?
  3. 3.🏋️ A machine lifts a load of 360 N when you push with 60 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ 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?
  5. 5.🏋️ A 14 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  6. 6.🏋️ A force of 380 N did 760 J of work. How many metres did the object move?
  7. 7.🏋️ A force of 100 N pushes a cart 10 m along the floor. How much work is done, in joules?
  8. 8.🏋️ A machine lifts a load of 340 N when you push with 170 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ Pushing a crate 6 m took 1200 J of work. What force was used, in newtons?
  10. 10.🏋️ A 2 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  11. 11.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 3250 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A machine lifts a load of 240 N when you push with 60 N. What is its mechanical advantage (MA)?
  13. 13.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1250 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 3200 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ A 7 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  16. 16.🏋️ A machine lifts a load of 120 N when you push with 30 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ Pushing a crate 10 m took 4600 J of work. What force was used, in newtons?
  18. 18.🏋️ A force of 400 N did 2000 J of work. How many metres did the object move?
  19. 19.🏋️ A machine lifts a load of 260 N when you push with 130 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load × effort (d) load ÷ effort
  21. 21.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, by half (d) yes, always
  22. 22.🏋️ A force of 470 N pushes a cart 10 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A force of 20 N pushes a cart 1 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) more effort (d) no effort
  25. 25.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
  26. 26.🏋️ A force of 350 N did 350 J of work. How many metres did the object move?
  27. 27.🏋️ A force of 220 N pushes a cart 8 m along the floor. How much work is done, in joules?
  28. 28.🏋️ A force of 290 N did 2030 J of work. How many metres did the object move?
  29. 29.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ A force of 10 N pushes a cart 7 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A force of 250 N pushes a cart 7 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A force of 30 N pushes a cart 8 m along the floor. How much work is done, in joules?
  33. 33.🏋️ Pushing a crate 8 m took 320 J of work. What force was used, in newtons?
  34. 34.🏋️ A 3 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  35. 35.🏋️ A force of 250 N pushes a cart 3 m along the floor. How much work is done, in joules?
  36. 36.🏋️ Pushing a crate 1 m took 10 J of work. What force was used, in newtons?
  37. 37.🏋️ A force of 140 N pushes a cart 9 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 290 N pushes a cart 10 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A 19 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ Pushing a crate 5 m took 350 J of work. What force was used, in newtons?

Answer key

  1. through a distance
  2. 500
  3. 6
  4. 300
  5. 700
  6. 2
  7. 1000
  8. 2
  9. 200
  10. 60
  11. 650
  12. 4
  13. 250
  14. 800
  15. 350
  16. 4
  17. 460
  18. 5
  19. 2
  20. load ÷ effort
  21. no, work stays the same
  22. 4700
  23. 20
  24. less effort
  25. 350
  26. 1
  27. 1760
  28. 7
  29. 100
  30. 70
  31. 1750
  32. 240
  33. 40
  34. 120
  35. 750
  36. 10
  37. 1260
  38. 2900
  39. 760
  40. 70

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