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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 638 · 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 longer ramp to the same height needs … (a) more effort (b) the same effort (c) no effort (d) less effort
  3. 3.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 4750 N box up it, in newtons? (ideal ramp, no friction)
  4. 4.🏋️ A 7 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 force of 380 N pushes a cart 8 m along the floor. How much work is done, in joules?
  6. 6.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3250 N box up it, in newtons? (ideal ramp, no friction)
  7. 7.🏋️ A 13 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  8. 8.🏋️ A 3 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 160 N pushes a cart 2 m along the floor. How much work is done, in joules?
  10. 10.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 3400 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ A machine lifts a load of 400 N when you push with 200 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ A machine lifts a load of 960 N when you push with 160 N. What is its mechanical advantage (MA)?
  13. 13.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 5700 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) newton (N) (d) metre (m)
  15. 15.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) only on Mondays (d) no, work stays the same
  16. 16.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ A machine lifts a load of 80 N when you push with 20 N. What is its mechanical advantage (MA)?
  18. 18.🏋️ A force of 120 N did 240 J of work. How many metres did the object move?
  19. 19.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
  20. 20.🏋️ A force of 280 N did 280 J of work. How many metres did the object move?
  21. 21.🏋️ An 18 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  22. 22.🏋️ A 3 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  23. 23.🏋️ A 15 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  24. 24.🏋️ A force of 340 N pushes a cart 2 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A machine lifts a load of 500 N when you push with 100 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) load ÷ effort (d) effort ÷ load
  27. 27.🏋️ A machine lifts a load of 60 N when you push with 20 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ Pushing a crate 10 m took 4100 J of work. What force was used, in newtons?
  30. 30.🏋️ Work is done when a force moves something … (a) through a distance (b) only upwards (c) very slowly (d) without moving it
  31. 31.🏋️ A 6 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  32. 32.🏋️ A 2 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  33. 33.🏋️ 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)
  34. 34.🏋️ A force of 210 N pushes a cart 9 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A force of 310 N did 620 J of work. How many metres did the object move?
  36. 36.🏋️ Pushing a crate 10 m took 1900 J of work. What force was used, in newtons?
  37. 37.🏋️ A force of 400 N did 4000 J of work. How many metres did the object move?
  38. 38.🏋️ A force of 380 N pushes a cart 2 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A force of 140 N did 280 J of work. How many metres did the object move?
  40. 40.🏋️ A force of 370 N did 1110 J of work. How many metres did the object move?

Answer key

  1. 950
  2. less effort
  3. 950
  4. 210
  5. 3040
  6. 650
  7. 260
  8. 30
  9. 320
  10. 850
  11. 2
  12. 6
  13. 950
  14. joule (J)
  15. no, work stays the same
  16. 300
  17. 4
  18. 2
  19. 600
  20. 1
  21. 180
  22. 60
  23. 150
  24. 680
  25. 5
  26. load ÷ effort
  27. 3
  28. 5
  29. 410
  30. through a distance
  31. 240
  32. 40
  33. 750
  34. 1890
  35. 2
  36. 190
  37. 10
  38. 760
  39. 2
  40. 3

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