Floating+and+Sinking+2

=​​​ ​ = = = =__ Table of Contents __= 1. Key Terms 2. Buoyancy and Buoyant Forces 3. Archimedes Principal 4. Density 5. Changing Density 6. Comparing Density 7. Resources

= Key terms =
 * Buoyancy-is an upward force on a body that immersed or partly immersed in a fluid.
 * Buoyant Force-a force acting in the opposite direction of gravity.
 * Archimedes Principal- states that the buoyant force acting on a submerged object equal to the weight of the fluid the object displaces.
 * Density-a measure of how much mass i containe in a given unit volume.

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Did you ever wonder how a ship floats and other thing lighter than a ship sinks? To learn that you would need to understand buoyancy. **Buoyancy** is an upward force on a body that is immersed or partly immersed in fluid. It is also floating and sinking. Another important thing you need to understand is A Buoyant Force."A Buoyant force acts in the direction opposite to the force of gravity, so it makes an object feel lighter." (Jones 83) If you have tried to lift something under water, you have experienced buoyant force. Pressure increases with depth so the upward pressure is greater on the bottom than on the top. "If an objects weight is equal to the buoyant force no net force acts on it, but if an objects weight is greater than the buoyant force a net force acts downward on the object." ( Jones 83) That explains the buoyant force. ======

One day while Archimedes was pondering the thought of finding the solution to his king’s problem. His king had paid a blacksmith to make him a solid gold crown. When he received his crown he had the thought that the crown wasn’t completely gold. So, this king assigned Archimedes to find out if it was all gold or not. Archimedes spent all day trying to figure it out. Until when he was stepping into his bathtub he realized the bath water overflowing. “Eureka!” He screamed. He was so ecstatic he ran down the streets naked screaming “ I’VE FOUND IT!” The reason for this celebration was that he found a way to see if the crown was all gold or not. Archimedes realized that if he put the crown in water and then put the same weight of a gold chunk, if they were both all gold they would sink at the same rate. It turns out the crown was gold mixed with silver, which is a much bulkier substance. Archimedes' Principal states that the buoyant force acting on a submerged object equal to the weight of the fluid the object displaces. Archimedes found out that a large object displaces more fluid than a smaller object. With this principal and a few other things you can find out a ship floats (Nagel)

**Density** The equation for density is **Density=Mass/Volume** and the units for this is cm^3. Density is mass per unit volume. **Density** is a measure of how much mass is contained in a given unit volume (Jones)

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You can change an objects density by changing the volume, mass, or the temperature.You can change the density of water by turning it into ice because you change the temperature and the mass.By changing an objects density, you can make it sink or float (Jones). ====== ==== By comparing densities you can predict whether objects will sink or float in a fluid.If an object is less dense than the fluid in which it is in, the object will float.If an object is more dense than the fluid in which it is in, the object will sink (Jones). ====