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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 323 · 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.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) metre (m) (d) joule (J)
  2. 2.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  3. 3.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ 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?
  5. 5.🏋️ A machine lifts a load of 1020 N when you push with 170 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1250 N box up it, in newtons? (ideal ramp, no friction)
  7. 7.🏋️ A force of 40 N pushes a cart 3 m along the floor. How much work is done, in joules?
  8. 8.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
  9. 9.🏋️ Pushing a crate 4 m took 120 J of work. What force was used, in newtons?
  10. 10.🏋️ 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?
  11. 11.🏋️ A force of 210 N pushes a cart 7 m along the floor. How much work is done, in joules?
  12. 12.🏋️ A force of 230 N did 1840 J of work. How many metres did the object move?
  13. 13.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ A machine lifts a load of 520 N when you push with 130 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ A force of 100 N did 600 J of work. How many metres did the object move?
  16. 16.🏋️ A force of 70 N pushes a cart 9 m along the floor. How much work is done, in joules?
  17. 17.🏋️ A force of 300 N pushes a cart 4 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A force of 110 N pushes a cart 2 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) the same effort (d) less effort
  20. 20.🏋️ A 12 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  21. 21.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 4800 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) only on Mondays (d) no, work stays the same
  23. 23.🏋️ 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?
  24. 24.🏋️ A force of 440 N did 3960 J of work. How many metres did the object move?
  25. 25.🏋️ A force of 450 N did 900 J of work. How many metres did the object move?
  26. 26.🏋️ A force of 220 N pushes a cart 1 m along the floor. How much work is done, in joules?
  27. 27.🏋️ A machine lifts a load of 120 N when you push with 60 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ A force of 60 N did 120 J of work. How many metres did the object move?
  29. 29.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A 17 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  32. 32.🏋️ A 15 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  33. 33.🏋️ A machine lifts a load of 900 N when you push with 150 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 2500 N box up it, in newtons? (ideal ramp, no friction)
  35. 35.🏋️ A force of 110 N pushes a cart 9 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A machine lifts a load of 480 N when you push with 160 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ A machine lifts a load of 1000 N when you push with 200 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A force of 240 N pushes a cart 5 m along the floor. How much work is done, in joules?

Answer key

  1. joule (J)
  2. 3
  3. 2
  4. 260
  5. 6
  6. 250
  7. 120
  8. load ÷ effort
  9. 30
  10. 180
  11. 1470
  12. 8
  13. 450
  14. 4
  15. 6
  16. 630
  17. 1200
  18. 220
  19. less effort
  20. 360
  21. 800
  22. no, work stays the same
  23. 160
  24. 9
  25. 2
  26. 220
  27. 2
  28. 2
  29. 800
  30. 600
  31. 170
  32. 600
  33. 6
  34. 500
  35. 990
  36. 3
  37. 100
  38. 5
  39. 2
  40. 1200

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