Mulyiplying the effect on the load in a rope system?

[Desmond108]

Alright, so this is a crude drawing of my current system set-up:

http://img233.imageshack.us/img233/3570/loadtx3.png

So what I want is a "multiplication" effect, like a 2 inch movement on the "A" side will cause a 4 inch movement on the load side.

So what should I put in the red circle to get this effect?

 

[Danger]

Welcome to PF, Desmond.
The setup as shown will simply give you a reversal of force. That is, you will need to pull down on the user end of the rope with a force in excess of the load's weight. It doesn't matter what sort of wheel you put at the top.
To gain (or in your case lose) mechanical advantage, you need a compound pulley system.
Note that pulley systems are usually applied for the opposite of your goal. Pulling the rope 1 foot will result in a 6 inch movement of the load, but requires only half of the force.
Your goal is usually achieved by other means.

 

[brewnog]

This sounds like homework.

Desmond, have a think about how you could use another pulley to lift the load more quickly than you're pulling. If not; have a look at some simple lifting arrangements on cranes.

 

[Desmond108]

Thanks a lot guys, I just looked at some diagrams of compound pulley systems and now I have what I need (well, I still got to put the system in a braced position).

You guys have been really helpful, I'm glad I joined PF.

My physics course at school in going to start soon so I'll probably be here more often then.

 

[brewnog]

No problem.

Danger - you need to clear out your PM box.

 

[Danger]

No problem.

Danger - you need to clear out your PM box.

Tell me about it.
The problem is that I keep all of my PM's, because they're important to me. I used to clean out the box by saving them to HD. Then W killed my computer a couple of months ago, so I have to use either this one at work or hers at home. Either way, I don't have a place to stash them. I'm thinking to relocate one of my desktop or tower Mac's to a room with an electrical outlet and drop my stuff in there.
Unfortunately, my e-mail account is similarly plagued, so you can't even get hold of me that way. I'll gladly PM you my phone #, but there might be a problem with the time zones. It's a cell, so I have it on all of the time, but I might not be awake.