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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 941 · 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 force of 390 N pushes a cart 6 m along the floor. How much work is done, in joules?
  2. 2.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) metre (m) (d) newton (N)
  3. 3.🏋️ A force of 370 N pushes a cart 5 m along the floor. How much work is done, in joules?
  4. 4.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) no, work stays the same (c) yes, by half (d) yes, always
  5. 5.🏋️ Pushing a crate 10 m took 1000 J of work. What force was used, in newtons?
  6. 6.🏋️ 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?
  7. 7.🏋️ A force of 170 N pushes a cart 4 m along the floor. How much work is done, in joules?
  8. 8.🏋️ Pushing a crate 8 m took 1040 J of work. What force was used, in newtons?
  9. 9.🏋️ A 19 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ A force of 450 N pushes a cart 6 m along the floor. How much work is done, in joules?
  12. 12.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ Pushing a crate 9 m took 2790 J of work. What force was used, in newtons?
  14. 14.🏋️ A force of 50 N did 100 J of work. How many metres did the object move?
  15. 15.🏋️ Pushing a crate 5 m took 650 J of work. What force was used, in newtons?
  16. 16.🏋️ A force of 20 N pushes a cart 2 m along the floor. How much work is done, in joules?
  17. 17.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) only upwards (d) without moving it
  18. 18.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3750 N box up it, in newtons? (ideal ramp, no friction)
  19. 19.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) more effort (d) no effort
  20. 20.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 6000 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ A force of 150 N pushes a cart 8 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A force of 120 N did 240 J of work. How many metres did the object move?
  24. 24.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ A force of 270 N did 1080 J of work. How many metres did the object move?
  26. 26.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A machine lifts a load of 240 N when you push with 80 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ Pushing a crate 10 m took 4900 J of work. What force was used, in newtons?
  29. 29.🏋️ A machine lifts a load of 360 N when you push with 180 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ A machine lifts a load of 240 N when you push with 120 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ A force of 140 N pushes a cart 2 m along the floor. How much work is done, in joules?
  32. 32.🏋️ Pushing a crate 1 m took 340 J of work. What force was used, in newtons?
  33. 33.🏋️ Pushing a crate 4 m took 160 J of work. What force was used, in newtons?
  34. 34.🏋️ A force of 470 N pushes a cart 10 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A 14 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  36. 36.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load ÷ effort (d) load + effort
  37. 37.🏋️ A machine lifts a load of 650 N when you push with 130 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ Pushing a crate 7 m took 2240 J of work. What force was used, in newtons?
  39. 39.🏋️ A machine lifts a load of 440 N when you push with 110 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A force of 360 N did 3240 J of work. How many metres did the object move?

Answer key

  1. 2340
  2. joule (J)
  3. 1850
  4. no, work stays the same
  5. 100
  6. 520
  7. 680
  8. 130
  9. 190
  10. 900
  11. 2700
  12. 250
  13. 310
  14. 2
  15. 130
  16. 40
  17. through a distance
  18. 750
  19. less effort
  20. 1000
  21. 1000
  22. 1200
  23. 2
  24. 100
  25. 4
  26. 100
  27. 3
  28. 490
  29. 2
  30. 2
  31. 280
  32. 340
  33. 40
  34. 4700
  35. 280
  36. load ÷ effort
  37. 5
  38. 320
  39. 4
  40. 9

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