Submarines are able to control their depth via ballast tanks that take on or release water to make the submarine more or less buoyant than the water around it, explains How Stuff Works. This causes the submarine to float or sink.Continue Reading
While at the surface, a submarine floats the same way a ship does. The water they displace is equal to the weight of the ship, which creates a buoyant force that counteracts gravity. However, submarines are different from other ships, because other ships have a set buoyancy and submarines can change how buoyant they are.
Submarines have ballast tanks that can be filled with either water or air. While on the surface, the submarine's tanks are filled with air, just as a ship is. When the crew of a submarine wants to sink, they discharge the air in their tanks and fill the tanks with water. Filling the tanks with water creates a negative buoyancy, and this negative buoyancy causes the ship to sink. The submarine crew can control the angle at which they dive by adjusting the angle of the short wings on the top of the submarine, also called hydroplanes. In case of emergency, submarines carry a supply of compressed air that allows them to return to the surface, should the need arise.Learn more about Motion & Mechanics
A submarine can submerge in and emerge from the water by controlling buoyancy through the use of ballast tanks, which are positioned in the middle of the internal and external hulls. It maintains positive buoyancy while resting and negative buoyancy when immersing into the water.Full Answer >
According How Stuff Works, friction is good because it prevents sliding while walking, it protects vehicles from skidding by slowing them down, and it makes writing possible. Friction occurs when two surfaces come into contact. Excess friction hinders movement, and it wastes energy. Friction refers to a force that opposes motion. It is important because it is applied in almost all life processes.Full Answer >
Expansion tanks function on the principle of thermal expansion, stating that water expands when heated. When the water tank is heated its volume will expand significantly and the overflow will spill into the expansion tank, which is attached to the water supply pipe and prevents the water pressure of the main water tank from getting too high.Full Answer >
As depth increases, pressure increases. For example, if a person is diving underwater, the pressure on the diver's body greatly increases the deeper she swims.Full Answer >