Why does system 3 require the same force as system 1?

[DrHughes]

Homework Statement

http://www.ph.utexas.edu/~cps/physics/powerpoint/Knight_ch15.ppt#282,6,Slide 6

Homework Equations

F2 = (A2/A1) F1

The Attempt at a Solution

I don't see why system 3 requires the same amount of force as system 1.

 

[DrHughes]

Hi,

I believe this is a question that requires a simple explanation without having to do any mathematics.

If people are disregarding this post, simply because it seems as if I am just thrusting the question out there, I am not.
The question is simple. It's a conceptual question.

So please take your time to answer.

 

[denverdoc]

which one? I got a slide show with several queations?

 

[DrHughes]

which one? I got a slide show with several queations?

the 3rd question please

thanx

 

[denverdoc]

1 just have to add up the velocities, first time i went thru it I was wrong.