BOY: Juliana, Eric and I are trying to keep up with my dad.
He has longer legs than us, so he can go faster than us.
ERIC: We're going to count how many steps it takes
to get to the end of the driveway.
ALL: One, two, three, four, five,
six, seven, eight, nine, ten,
11, 12, 13, 14, 15, 16, 17.
12 steps.
15 steps.
16 steps.
17 steps.
Why does it take me less steps?
You have bigger steps than us,
which makes you go a little bit farther than us.
I'm going to try and see
if I can put chalk right when he puts down his foot.
We are trying to mark each footstep so we can measure them.
That was not right.
DAD: Maybe what we can do
is try and wet the bottom of Eric's footprints
so that every time he takes a step,
he will leave a big, wet footprint.
ERIC: As soon as I make my footprints,
Kyle can do the marks so we can measure the length of our steps.
I'm going to take this yardstick
and measure the distance of one footstep.
22 and a half inches.
We each measured our step length.
19 inches.
17 inches.
31 inches.
And do you think that explains why it was so easy for me
to walk a little faster than you?
Yes.
Let's try and walk in each other's steps.
KYLE: Try measuring and counting footsteps.