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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 676 · 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 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ A force of 430 N did 1290 J of work. How many metres did the object move?
  3. 3.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) no, work stays the same (d) only on Mondays
  4. 4.🏋️ Pushing a crate 2 m took 980 J of work. What force was used, in newtons?
  5. 5.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
  6. 6.🏋️ A force of 300 N did 2400 J of work. How many metres did the object move?
  7. 7.🏋️ A force of 200 N did 600 J of work. How many metres did the object move?
  8. 8.🏋️ A 7 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  9. 9.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load ÷ effort (d) load + effort
  10. 10.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ A 14 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  12. 12.🏋️ A machine lifts a load of 1020 N when you push with 170 N. What is its mechanical advantage (MA)?
  13. 13.🏋️ Pushing a crate 4 m took 200 J of work. What force was used, in newtons?
  14. 14.🏋️ A force of 360 N did 1800 J of work. How many metres did the object move?
  15. 15.🏋️ A force of 70 N pushes a cart 10 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A force of 210 N did 2100 J of work. How many metres did the object move?
  17. 17.🏋️ A force of 380 N pushes a cart 1 m along the floor. How much work is done, in joules?
  18. 18.🏋️ Pushing a crate 6 m took 1140 J of work. What force was used, in newtons?
  19. 19.🏋️ A machine lifts a load of 160 N when you push with 40 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ A 5 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  22. 22.🏋️ A force of 110 N did 330 J of work. How many metres did the object move?
  23. 23.🏋️ A machine lifts a load of 360 N when you push with 120 N. What is its mechanical advantage (MA)?
  24. 24.🏋️ A force of 60 N pushes a cart 3 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A machine lifts a load of 1140 N when you push with 190 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A force of 440 N pushes a cart 4 m along the floor. How much work is done, in joules?
  27. 27.🏋️ A force of 340 N did 3400 J of work. How many metres did the object move?
  28. 28.🏋️ A force of 290 N pushes a cart 4 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A force of 90 N did 180 J of work. How many metres did the object move?
  30. 30.🏋️ A force of 80 N did 240 J of work. How many metres did the object move?
  31. 31.🏋️ A force of 390 N pushes a cart 10 m along the floor. How much work is done, in joules?
  32. 32.🏋️ 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?
  33. 33.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  34. 34.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) more effort (d) no effort
  35. 35.🏋️ A machine lifts a load of 280 N when you push with 70 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ A machine lifts a load of 560 N when you push with 140 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 3250 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ 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?
  40. 40.🏋️ An 11 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. 750
  2. 3
  3. no, work stays the same
  4. 490
  5. 800
  6. 8
  7. 3
  8. 350
  9. load ÷ effort
  10. 400
  11. 560
  12. 6
  13. 50
  14. 5
  15. 700
  16. 10
  17. 380
  18. 190
  19. 4
  20. 600
  21. 250
  22. 3
  23. 3
  24. 180
  25. 6
  26. 1760
  27. 10
  28. 1160
  29. 2
  30. 3
  31. 3900
  32. 170
  33. 200
  34. less effort
  35. 4
  36. 4
  37. 650
  38. 800
  39. 190
  40. 110

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