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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 777 · 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 500 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2850 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ A force of 100 N pushes a cart 2 m along the floor. How much work is done, in joules?
  4. 4.🏋️ Pushing a crate 2 m took 380 J of work. What force was used, in newtons?
  5. 5.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) effort ÷ load (d) load + effort
  6. 6.🏋️ A machine lifts a load of 360 N when you push with 120 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  8. 8.🏋️ A 5 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  9. 9.🏋️ 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?
  10. 10.🏋️ A force of 370 N did 370 J of work. How many metres did the object move?
  11. 11.🏋️ 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
  12. 12.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ A force of 350 N pushes a cart 10 m along the floor. How much work is done, in joules?
  14. 14.🏋️ A force of 150 N pushes a cart 4 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A force of 380 N pushes a cart 1 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A force of 320 N pushes a cart 5 m along the floor. How much work is done, in joules?
  17. 17.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) newton (N) (d) joule (J)
  18. 18.🏋️ A 1 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  19. 19.🏋️ A 9 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  20. 20.🏋️ Pushing a crate 7 m took 1820 J of work. What force was used, in newtons?
  21. 21.🏋️ A machine lifts a load of 240 N when you push with 80 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) without moving it (d) very slowly
  23. 23.🏋️ A force of 110 N did 110 J of work. How many metres did the object move?
  24. 24.🏋️ A force of 130 N pushes a cart 4 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A force of 250 N pushes a cart 2 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A 16 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ Pushing a crate 5 m took 100 J of work. What force was used, in newtons?
  28. 28.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) the same effort (d) less effort
  29. 29.🏋️ A force of 360 N did 360 J of work. How many metres did the object move?
  30. 30.🏋️ A machine lifts a load of 160 N when you push with 80 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ Pushing a crate 6 m took 1620 J of work. What force was used, in newtons?
  32. 32.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1950 N box up it, in newtons? (ideal ramp, no friction)
  33. 33.🏋️ A force of 40 N did 40 J of work. How many metres did the object move?
  34. 34.🏋️ A force of 40 N did 160 J of work. How many metres did the object move?
  35. 35.🏋️ Pushing a crate 3 m took 1140 J of work. What force was used, in newtons?
  36. 36.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ A force of 430 N pushes a cart 2 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ A 4 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ A force of 480 N pushes a cart 8 m along the floor. How much work is done, in joules?

Answer key

  1. 250
  2. 950
  3. 200
  4. 190
  5. load ÷ effort
  6. 3
  7. 600
  8. 100
  9. 40
  10. 1
  11. no, work stays the same
  12. 50
  13. 3500
  14. 600
  15. 380
  16. 1600
  17. joule (J)
  18. 30
  19. 270
  20. 260
  21. 3
  22. through a distance
  23. 1
  24. 520
  25. 500
  26. 160
  27. 20
  28. less effort
  29. 1
  30. 2
  31. 270
  32. 650
  33. 1
  34. 4
  35. 380
  36. 450
  37. 860
  38. 700
  39. 120
  40. 3840

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