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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 430 · 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 50 N pushes a cart 1 m along the floor. How much work is done, in joules?
  2. 2.🏋️ A 15 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ An 18 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  4. 4.🏋️ Pushing a crate 9 m took 2160 J of work. What force was used, in newtons?
  5. 5.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ A force of 290 N pushes a cart 4 m along the floor. How much work is done, in joules?
  7. 7.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  8. 8.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) joule (J) (d) metre (m)
  9. 9.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 100 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ Pushing a crate 10 m took 1000 J of work. What force was used, in newtons?
  11. 11.🏋️ A machine lifts a load of 240 N when you push with 80 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ A machine lifts a load of 840 N when you push with 140 N. What is its mechanical advantage (MA)?
  13. 13.🏋️ A force of 90 N did 180 J of work. How many metres did the object move?
  14. 14.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ A force of 290 N did 1160 J of work. How many metres did the object move?
  16. 16.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) very slowly (d) only upwards
  17. 17.🏋️ A machine lifts a load of 240 N when you push with 40 N. What is its mechanical advantage (MA)?
  18. 18.🏋️ Pushing a crate 10 m took 4500 J of work. What force was used, in newtons?
  19. 19.🏋️ A force of 400 N did 3600 J of work. How many metres did the object move?
  20. 20.🏋️ A force of 380 N did 1140 J of work. How many metres did the object move?
  21. 21.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2550 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2850 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ A force of 130 N pushes a cart 5 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A force of 260 N did 260 J of work. How many metres did the object move?
  26. 26.🏋️ A force of 10 N did 60 J of work. How many metres did the object move?
  27. 27.🏋️ 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?
  28. 28.🏋️ A force of 200 N pushes a cart 10 m along the floor. How much work is done, in joules?
  29. 29.🏋️ 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
  30. 30.🏋️ Pushing a crate 5 m took 1650 J of work. What force was used, in newtons?
  31. 31.🏋️ A 19 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 longer ramp to the same height needs … (a) no effort (b) the same effort (c) more effort (d) less effort
  33. 33.🏋️ A force of 260 N pushes a cart 7 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A 6 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  35. 35.🏋️ A machine lifts a load of 180 N when you push with 30 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ An 18 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  37. 37.🏋️ Pushing a crate 1 m took 10 J of work. What force was used, in newtons?
  38. 38.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3200 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ A force of 390 N did 780 J of work. How many metres did the object move?
  40. 40.🏋️ A 7 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. 50
  2. 300
  3. 720
  4. 240
  5. 5
  6. 1160
  7. 900
  8. joule (J)
  9. 50
  10. 100
  11. 3
  12. 6
  13. 2
  14. 200
  15. 4
  16. through a distance
  17. 6
  18. 450
  19. 9
  20. 3
  21. 850
  22. 950
  23. 400
  24. 650
  25. 1
  26. 6
  27. 40
  28. 2000
  29. no, work stays the same
  30. 330
  31. 760
  32. less effort
  33. 1820
  34. 180
  35. 6
  36. 540
  37. 10
  38. 800
  39. 2
  40. 140

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