1. Buoyancy

2. Goal of the class
To understand buoyancy and why objects float or sink.
Question of the day: What is neutrally buoyant?
Previous answer: Explosive decompression is when the air pressure drops rapidly.
Previous Question: What is explosive decompression?

3. Floating and Sinking
In April 1912, the Titanic set sail from England on its first and only voyage. It was considered to be unsinkable, however, a few days later it hit an iceberg and sank.
How can a ship be made to float, but shortly after be sinking?
There is a famous movie with Leo.
The ship was compartmentalised.

4. Buoyancy Ships are designed to be buoyant (to float).
This is caused by the buoyant force.
The buoyant force allows you to pick heavy objects up when under water with ease.
The buoyant force acts upwards (against gravity)
Show pressure on a cube and explain how the force differs for top and bottom.

5. Floating and Sinking
Remember an object’s weight is its mass multiplied by gravitational acceleration.
If this is bigger than the buoyant force it will sink.
If this is smaller than the buoyant force it will float.
Some animals are neutrally buoyant.

6. Floating and Sinking
Remember an object’s weight is its mass multiplied by gravitational acceleration.
If this is bigger than the buoyant force it will sink.
If this is smaller than the buoyant force it will float.
Some animals are neutrally buoyant.