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# Submarines and Buoyancy

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## Taylor Williamson

on 8 May 2013

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#### Transcript of Submarines and Buoyancy

By: Taylor Williamson, Maggie Majewski,
and Claire Popp. Math Used In Buoyancy Buoyancy of a submarine Hull Design Submarines can stay submerged for weeks Buoyancy
- Upward force
- Ability to float depends on density
- Object that is less dense than fluid can float
-Object that is more dense than fluid will sink equation: Battery Technology Submarines. http://www.60secondscience.net/entry-gallery/viewvideo/751/international-secondary--high-school/buoyancy Ballast tanks Fuel fuel tank: designed to replace fuel with water as the fuel is consumed to maintain the trim of the submarine.

diesel fuel is lighter than the water which means it's more buoyant, so it will float to the top of the tank where it can be used to run the submarine. Modern submarine Modern submarines have a cylindrical hull that tapers at one end and forms a blunt, rounded nose at the other end.

They are usually made of high-quality steel but may also be made out of titanium.

Most modern submarines are powered by nuclear energy, though some rely on diesel engines and electric batteries for propulsion. EXPLANATION OF THE EQUATION. Fb=PA The equation is Fb=PA. The P stands for Pressure and the A stands for Area. Take pressure and multiply it by the area. The Fb stands for the buoyant force. The total buoyancy is the weight of the displaced water. In WWII, submarines' design limited their diving depth capability
teardrop and cigar shaped
(spherical hulls are much stronger at deeper depths)
changing the hull material, the speeds of submarines underwater dramatically increased
In the past, submarines traveled faster on the surface than underwater, but the opposite is true today if the submarine has air in the ballast tanks ( the place where the submarine can either hold water or air) then the submarine will float

if the ballast tanks are filled with water then the submarine will sink since the weight increased

if the water the submarine displaces is less or equal to the weight of the submarine, then it will float Buoyancy Video! ^Click on the video to view^ During WWII, submarines could only be submerged for hours
the speed is limed with the battery though
having a snorkel causes the submarine to be a target to any nuclear submarine The video shows how a submarine would float on water. The students doing the experiment, they shape the tin foil into a boat shape and gently place it on the water. Before they do the experiment, they explain the definition of buoyancy and give the procedure with the lab they were doing. This video is a sixty second video but it covers the main details of how something would float on water. negative tank: a tank that is negatively buoyant when it is flooded and when it is full, it allows you to descend quickly

once the submarine is at the right depth the water will be pushed out of the negative tank to maintain neutral buoyancy

when the sub rises the tanks have to be emptied to decrease the weight of the sub compared to water displacement

buoyancy and trim tanks: push water and air between them, which helps balance the sub.
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