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Submarines

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by

eva hiller

on 14 February 2014

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Transcript of Submarines

Submarines
It travels far distances and depths underwater. It is used for finding or devealoping scientific research, or is used in warfare.
HOW FAST DO SUBMARINES GO?
Submarines travel around 25 knots, or 29 miles per hour.
WHO USES IT?
The submarine is used primarily in navies, particularly during WWI and WWII, as well as by scientists and marine biologists.
WHAT MATERIALS ARE USED TO MAKE IT?
The main material used in submarines is steel.HY80 Steel is made to built submarines, it is flexible and can expand or contract with water pressure. It is used to form the inner hull, as well as the outer hull.
What forces are involved in the operation of a submarine?
The forces that are involved in the operation of a submarine are drag, buoyancy force, its weight, and the engine force.
SUBMARINES
Cornelis Drebbel invented the submarine in 1620.

A submarine is a watercraft capable of submerging under the water for intellectual or military purposes.

Before Submarines, people had very few ways of safely submerging, so they had to travel above water with boats.
WHAT DOES THE DEVICE DO?
What energy changes take place when you use it?
The energy changes that take place when you use it is when the submarine is not in motion, that is when it has potential energy. When you start to operate it and use it the potential energy converts into kinetic energy.

Bibliography
http://en.wikipedia.org/wiki/Submarine#Usage
http://www.navy.mil/navydata/cno/n87/faq.html
http://www.madehow.com/Volume-5/Nuclear-Submarine.html
Mrs.Bertrand
By Gillian Handy and Eva Hiller
Improvements
Some Improvements that could be made to Submarines is to install an Emergency Flotation and Service Call in case the submarine falters and cannot resurface.
Another improvement that could be made is to try and discover a material that keeps the existing benifits of steel, but is stronger as sometimes submarines can be crushed under water pressure.
MOTION
When the propellers move, this is mechanical energy. It pushes the submarine through the water.
Full transcript