# Physics pulley problem

## Homework Statement

we did a lab on pulleys. The weight lifted was 19.62 N. It rose 0.20 meter with us applying a lifting force of 11 N and pulling the rose a distance of 0.16.

## The Attempt at a Solution

I tried to find the efficiency of the pulley, so E=work out/work in
so work out=FD=(19.62)(0.20)=3.92
and work in=FD=(11)(0.16)=1.76
yet the work output cant be greater than the work input, so I'm clearly doing something wrong.

Any ideas? Is it a math error or bad lab results? Any help would be great :)

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Doc Al
Mentor
It's not a math problem. Those measurements don't make sense. How did you measure the applied force and distances?

oh no. That means the whole lab is wrong, but I'm doing the math right?
We measured the applied force with a spring scale and the distances with a ruler. i think the distances are completely wrong now...

Doc Al
Mentor
That means the whole lab is wrong, but I'm doing the math right?