GIRL: That's me and Solmara.
We made a ramp with a book and a ball.
The ball rolls down the book pretty fast.
I'm using my leg as a ramp.
GIRL: My leg is a good ramp.
When I move my foot like this, it turns different directions.
See?
We have a ramp made out of a book,
we have a finish line made out of a book,
and we have two balls.
This ball is heavy, this ball is light.
And we're going to see which one wins a race.
Three, two, one, zero.
The wooden ball hit the finish line first.
I wonder why the heavier wooden ball won the race?
These are about the same weight
but one is bigger and one is smaller.
I'm using a bigger ramp,
and the little ball goes pretty far.
I wonder why the bigger ball went further
than the little ball?
We are making a kind of bowling game.
Go.
See what happens when you play
with different kinds of ramps and balls.
(girls giggling)