Ships, Boats & the Deep
7 interactive videos. Watch each one, then try the idea live. Free, no account.
Why Boats Float
Push water aside and it shoves back — that shove holds a boat up. And the very same rule is how a ship of solid steel floats when a steel ball sinks.
How a Submarine Dives
A sub doesn't have an elevator. It changes its OWN weight — letting water in to sink, blowing it out to rise.
How Boats Move
A propeller throws water backward. The water throws the boat forward. Newton, in the ocean.
Sailing Into the Wind
Sailboats can sail almost STRAIGHT toward the wind. The sail is a wing, and the keel is the trick.
Why Ships Don't Tip Over
Lean a ship and the water shoves back to stand it up — until you stack the cargo too high.
How Submarines See in the Dark
No windows, no light, miles deep. A sub 'sees' with sound — a ping, an echo, and a little math.
Boats of Every Shape
Plow through, skim on top, ride on wings, or float on air — four ways to beat the water.