Suspension bridge.

First off, what do we know about suspension?

They work best in tension, not compression.

Krishana's right.

The ropes and cables in a suspension bridge work in tension, not compression.

When a material is pulled, it's in tension.

When it's pushed or squeezed, it's in compression.

The hanging deck of a suspension bridge pulls on the vertical ropes.

These ropes then pull on the main cables, placing them in tension.

While under tension, the main cables push down on the supporting towers, placing them in compression.

We're going to need some kind of flat surface for the roadway.

We need the towers.

We're also going to need the anchor points on either side.

Yeah.

We could use natural, or we could try to make our own, which would be a little tough, because we'd have to kind of hammer it into the ground.

An anchor point goes into the ground?

The anchor point makes it so that it pulls it out taut, and the towers keep it up.

On the tree side, we almost don't even need anchors, but the anchors are going to be really important on the artificial side.

So let's not even put anchors back here.

We're going to need a lot of rope.

Rope.

The main cable here is bigger than the smaller cables, because it takes the total load of all the smaller cables.

Right.

So we might want to make two different kinds of rope.

I think every three or four feet we should have a small cable to prevent the sag.

That sounds pretty good.

I think we should, like, figure out where we're going to lay it out across.

Yeah.

I think we need to look at our materials first.

Let's throw this board across and find out what we're spanning exactly.

Watch out, guys.

Move out of the way.

And that's our span.