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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 338 · 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 19 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.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 4800 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 150 N box up it, in newtons? (ideal ramp, no friction)
  4. 4.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1700 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ A machine lifts a load of 600 N when you push with 120 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ A force of 90 N did 720 J of work. How many metres did the object move?
  7. 7.🏋️ Pushing a crate 3 m took 300 J of work. What force was used, in newtons?
  8. 8.🏋️ An 8 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  9. 9.🏋️ A force of 370 N did 370 J of work. How many metres did the object move?
  10. 10.🏋️ Pushing a crate 8 m took 2400 J of work. What force was used, in newtons?
  11. 11.🏋️ A force of 30 N pushes a cart 7 m along the floor. How much work is done, in joules?
  12. 12.🏋️ An 8 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  13. 13.🏋️ 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
  14. 14.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1100 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ A machine lifts a load of 320 N when you push with 80 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A force of 100 N pushes a cart 9 m along the floor. How much work is done, in joules?
  17. 17.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ 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)
  19. 19.🏋️ Pushing a crate 1 m took 370 J of work. What force was used, in newtons?
  20. 20.🏋️ A force of 40 N pushes a cart 5 m along the floor. How much work is done, in joules?
  21. 21.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3500 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) only upwards (d) without moving it
  23. 23.🏋️ A 9 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  24. 24.🏋️ A force of 300 N did 3000 J of work. How many metres did the object move?
  25. 25.🏋️ A force of 400 N pushes a cart 1 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A 16 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) metre (m) (d) newton (N)
  28. 28.🏋️ A 19 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  29. 29.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1100 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ A 13 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  31. 31.🏋️ Pushing a crate 2 m took 800 J of work. What force was used, in newtons?
  32. 32.🏋️ A machine lifts a load of 640 N when you push with 160 N. What is its mechanical advantage (MA)?
  33. 33.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  34. 34.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2850 N box up it, in newtons? (ideal ramp, no friction)
  35. 35.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load × effort (d) load ÷ effort
  36. 36.🏋️ A force of 340 N pushes a cart 4 m along the floor. How much work is done, in joules?
  37. 37.🏋️ A machine lifts a load of 450 N when you push with 150 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ Pushing a crate 2 m took 680 J of work. What force was used, in newtons?
  39. 39.🏋️ A force of 350 N pushes a cart 6 m along the floor. How much work is done, in joules?
  40. 40.🏋️ A force of 120 N pushes a cart 6 m along the floor. How much work is done, in joules?

Answer key

  1. 950
  2. 800
  3. 50
  4. 850
  5. 5
  6. 8
  7. 100
  8. 80
  9. 1
  10. 300
  11. 210
  12. 160
  13. no, work stays the same
  14. 550
  15. 4
  16. 900
  17. 1000
  18. 950
  19. 370
  20. 200
  21. 700
  22. through a distance
  23. 450
  24. 10
  25. 400
  26. 480
  27. joule (J)
  28. 570
  29. 550
  30. 520
  31. 400
  32. 4
  33. 400
  34. 950
  35. load ÷ effort
  36. 1360
  37. 3
  38. 340
  39. 2100
  40. 720

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