Listen in page
Listen Now
Song Lyrics
(Verse 1)
I have a rock, so hard and gray,
I wonder if it'll float today?
I drop it in the water, splash!
It sinks right down, a little flash!
(Chorus)
Buoyancy, buoyancy!
That push-up force inside the sea!
It tries to lift things from below,
To make them stay and not to go!
(Verse 2)
But look at this, a big log, see?
It's heavy as can be!
I put it in the water, plop!
It floats right there, right on the top!
(New Verse)
The log is lighter for its size,
It floats right up before our eyes!
But the little rock is heavy for its space,
So it sinks down without a trace!
(Chorus)
Buoyancy, buoyancy!
That push-up force inside the sea!
It tries to lift things from below,
To make them stay and not to go!
(Bridge)
A tiny boat can float so well,
While a small coin goes down to tell
That buoyancy has rules to play,
On what will sink and what will stay!
(Chorus)
Buoyancy, buoyancy!
That push-up force inside the sea!
It tries to lift things from below,
To make them stay and not to go!
About the song
Float or sink? Learn about buoyancy and density in this splashing song!
Discover why some things float and others sink through the science of buoyancy and density!
FAQs
Why does a log float but a rock usually sinks?
A log is usually less dense than water, so water can push up enough to hold it. Most rocks are denser than water, so they sink.
What is buoyancy?
Buoyancy is the upward push a fluid gives to an object. If that upward push is strong enough compared with the object's weight, it floats.
How can a huge metal ship float?
A ship is shaped to displace lots of water and hold air inside. The whole ship can be less dense than the water it pushes aside.
What can kids test at home?
Put a sealed empty bottle, a water-filled bottle, a spoon, and a piece of wood in a tub. Compare shape, air pockets, and density.