>> Ahoy there, you landlubbers.

Here'’’s the deal.

Green Team got their sailing lesson already.

Ready for your sailing instruction?

>> Yeah, definitely.

Let'’’s go.

>> Purple Team, this is Rosemary.

Rosemary is an expert sailor and a very experienced sailing instructor, so you guys are in good hands.

>> Awesome.

>> Great.

>> Purple Team, let'’’s go.

>> All right.

>> So you guys know how a rudder works, basically.

When I push right, we go left.

When I push it left, we go right.

So right now I'’’m pulling down the center board.

It'’’s a big piece of fiberglass that sticks down beneath the boat.

What that does is it keeps the wind from pushing us sideways, simple as that.

All right, so does anybody know how a sail works?

>> Newton states that a force must be applied to an object to make it move in a curved path.

When air molecules hit a sail, it pushes them in a curved path along the front or windward side of the sail.

At the same time, air molecules are pulled in a curved path around the back or leeward side of the sail.

But Newton also states that for every action there is an equal and opposite reaction.

So the pushed molecules create a pushing force on the windward side of the sail.

And the air molecules being pulled create a pulling force on the leeward side of the sail.

These pushing and pulling forces combine to propel the boat forward.