Mr. P: Good morning.
Today we're going to drop different combinations
of dictionaries, to prove the mass independence
of the acceleration due to gravity.
And dance.
Here we go!
Bo: Hey, guys.
Billy: Hey, Bo!
Bobby: H-hi, Bo.
♫ (lyrics) Flipping Physics ♫
Mr. P: One of the things that's we've talked about
quite a bit already is that the mass
is irrelevant when it comes to free fall.
In other words, no matter what the mass of the object,
on Earth, in the vacuum that you can breathe,
it will accelerate downward at a rate
of 9.81 meters per second squared.
We are going to prove it today
by dropping different combinations of dictionaries.
Billy, you asked to throw the ball last time
but I was unable to let you do that,
so why don't you go outside this time
and drop some dictionaries, please.
Billy: Oh, thank you!
Bobby: No way!
Bo: He gets to go outside.
Mr. P: Alright, Billy, start by grabbing
the blue English German dictionary
that I inherited from my maternal grandparents.
Walk to the top of the ladder,
hold the dictionary at the top
of the 2.0 meter stick, and drop it, please.
(Billy laughs)
Now grab the blue and red dictionary
my wife uses when she pummels me in scrabble.
Tie it to the blue dictionary,
and walk to the top of the ladder.
And again, drop it from 2.0 meters, please.
(Billy chuckles)
And now grab the red dilapidated dictionary
that I use to slam against objects
and discuss Newton's third law
and bind them to the other two books, and drop them, please.
Billy: (laughs) This is fun!
Mr. P: And lastly, tie the giant dictionary
my wife received for Christmas when she was 15
instead of the boom box she was really hoping for,
and she never did end up receiving.
Bobby: Boom box?
What's a boom box?
(music from boom box)
Billy: This is massive!
Gah!
Mr. P: And drop them.
(Billy cackles)
Alright, Billy, please come back in.
So now we can take all four videos,
splice them into just the free fall portion
to show that they all fall at the same rate, and voila!
You can see that regardless of the fact
that each of these has a different mass,
they all take the exact same amount of time to fall.
And therefore, all have the exact same
acceleration in the y direction.
And if that isn't enough proof,
I will loop them in order and show that.
(books thud in rhythm) One book,
two books, three books, four books!
One book, two books, three books, four books!
Can you feel it?
I can feel it.
(snaps thumbs) Because you can dance to it.
(makes noises in time to the books falling)
(singing) We can dance if we want to.
We can leave your friends behind.
'Cause your friends don't dance,
and if they don't dance, well they're no friends of mine.
I say, we can go where we want to.
The night is young and so am I.
We can act real cool and totally removed
and we can act like and imbecile.
Bobby: Man, if he were my dad I'd be really embarrassed.
Mr. P: (singing) Oh we can dance, and sing!
(laughs)
There you go.
Dropping dictionaries and dancing
to prove the mass independence
of the acceleration due to gravity.
Oh yeah.
Thank you very much for learning with me today.
I enjoyed learning with you.
(books thud)
(singing) Oh we can dance if we want to.
We can leave your friends behind.
'Cause your friends don't dance
and if they don't dance, well they're no friends of mine.
I say, we can go where we want to.
The night is young and so am I.
And we can act real cool and totally removed
and we can act like an imbecile.
I say!
We can dance, we can dance, and sing!
Everybody's taking the chance.
Mr. P on the left: We can dance and stuff and sing!
Mr. P middle right: We can dance all night, we can dance (laughs)
Mr. P on the left: That's enough.
Mr. P on left: I can feel it!
(books thud)