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# Floating and Sinking Notes

Density and Buoyant Force
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on 28 October 2015

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#### Transcript of Floating and Sinking Notes

Density and Buoyant Force
Floating and Sinking
If you can keep the same volume, but change the mass, you can change the overall density of an object.
How does mass affect density?
One reason objects float or sink is their density.
An object that is more dense than the fluid in which it is immersed sinks.
An object that is less dense than the fluid in which it is immersed floats to the surface.
If the density of an object is equal to the density of the fluid in which it is immersed, the object neither rises nor sinks in the fluid; it floats at a constant level.
How does density affect floating and sinking
Water exerts a force called buoyant force that acts on a submerged object.
Buoyant force acts in the upward direction, against the force of gravity, so it makes an object feel lighter.
Buoyant Force - another reason why things float!
It states that the buoyant force on an object is equal to the weight of the fluid displaced by the object.
Archimedes’ Principle
Therefore, the more fluid an object displaces, the more buoyant force it will have.
The more surface area an object occupies, the more water is displaces.
This is why it is easier to float in water when you are lying down on your back – you take up more surface area, displacing more water, therefore creating a greater buoyant force.
Submarines can change their overall mass by filling or emptying the flotation tanks
How does volume affect density?
If the mass remains the same, but we can change the volume of an object, its density will change as well
For the same volume, the more mass there is, the more density
For the same mass, the more volume there is, the less density
Ships that are made out of tons of steel can float because they take up a lot of surface area and displace a lot of water
Full transcript