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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 917 · 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 2 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ Pushing a crate 1 m took 190 J of work. What force was used, in newtons?
  3. 3.🏋️ 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?
  4. 4.🏋️ Pushing a crate 4 m took 1560 J of work. What force was used, in newtons?
  5. 5.🏋️ A machine lifts a load of 210 N when you push with 70 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ A force of 190 N pushes a cart 1 m along the floor. How much work is done, in joules?
  7. 7.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) more effort (d) no effort
  8. 8.🏋️ A machine lifts a load of 40 N when you push with 20 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ A force of 400 N did 1600 J of work. How many metres did the object move?
  10. 10.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2850 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ A force of 430 N pushes a cart 9 m along the floor. How much work is done, in joules?
  12. 12.🏋️ 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)
  13. 13.🏋️ A 20 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 force of 80 N pushes a cart 3 m along the floor. How much work is done, in joules?
  15. 15.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) yes, by half (d) no, work stays the same
  16. 16.🏋️ Pushing a crate 2 m took 540 J of work. What force was used, in newtons?
  17. 17.🏋️ A 1 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  18. 18.🏋️ Pushing a crate 1 m took 110 J of work. What force was used, in newtons?
  19. 19.🏋️ A 2 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  20. 20.🏋️ A force of 130 N pushes a cart 5 m along the floor. How much work is done, in joules?
  21. 21.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 4250 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ A force of 280 N pushes a cart 4 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A force of 80 N did 560 J of work. How many metres did the object move?
  24. 24.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 4750 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) very slowly (d) without moving it
  26. 26.🏋️ A force of 120 N did 240 J of work. How many metres did the object move?
  27. 27.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) joule (J) (d) newton (N)
  28. 28.🏋️ A machine lifts a load of 480 N when you push with 160 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 700 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ 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?
  31. 31.🏋️ 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)
  32. 32.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) load × effort (d) effort ÷ load
  33. 33.🏋️ A force of 120 N pushes a cart 3 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A force of 260 N pushes a cart 4 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 450 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ A force of 140 N did 980 J of work. How many metres did the object move?
  37. 37.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ A machine lifts a load of 160 N when you push with 80 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ Pushing a crate 1 m took 240 J of work. What force was used, in newtons?
  40. 40.🏋️ A 10 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. 900
  2. 190
  3. 350
  4. 390
  5. 3
  6. 190
  7. less effort
  8. 2
  9. 4
  10. 950
  11. 3870
  12. 100
  13. 1000
  14. 240
  15. no, work stays the same
  16. 270
  17. 40
  18. 110
  19. 20
  20. 650
  21. 850
  22. 1120
  23. 7
  24. 950
  25. through a distance
  26. 2
  27. joule (J)
  28. 3
  29. 350
  30. 250
  31. 100
  32. load ÷ effort
  33. 360
  34. 1040
  35. 150
  36. 7
  37. 300
  38. 2
  39. 240
  40. 500

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