A man lifts various loads with the same lever. The distance of the applied force from the fulcrum is 2.00 m and the distance from the fulcrum to the load is 0.500 m. A graph of resistance force vs. effort force is shown. What is the mechanical advantage of the lever? What is the ideal mechanical advantage of the lever? What is the efficiency of the lever? Show your work.

Question

inexilewetrust · Answer

http://assets.openstudy.com/updates/attachments/4f3afa75e4b0fc0c1a0ed7b1-jazzycaz-1329265292634-untit.bmp

anonymous · Answer

Okay so what do you need help with?

inexilewetrust · Answer

I am trying to solve for efficiency

inexilewetrust · Answer

I got 2 as my mechanical advantage, this is correct right?

anonymous · Answer

Yes I believe that is correct.

inexilewetrust · Answer

Awesome! How do I solve for efficiency?

anonymous · Answer

Do you know the formula to find efficiency?

inexilewetrust · Answer

No, I don't know

anonymous · Answer

efficiency = (useful energy transferred / energy supplied) x 100.

inexilewetrust · Answer

How do I get that from the graph?

anonymous · Answer

Your effort force goes by tens. And by the looks of it your resistance force goes by 25.

anonymous · Answer

The effort force would be the energy supplied and the resistance force would be energy transferred.

inexilewetrust · Answer

Okay, how do I go about this?

anonymous · Answer

Let's say you use the first point. The effort force is 10 and your resistance force is 75. efficiency = (75 / 10) x 100.

inexilewetrust · Answer

okay so the answer for your example is 750?

anonymous · Answer

Yes that's correct.

inexilewetrust · Answer

okay, which one do I used to answer the question  in this case from the graph?

anonymous · Answer

This would be used for the efficiency of the lever.

inexilewetrust · Answer

Not following..

anonymous · Answer

The 750 would be the answer to the question asking for efficiency.