1 / 7

11.2

11.2. Floating and Sinking. Buoyancy. When you pick up an object underwater it seems much lighter due to the upward force that water and other fluids exert known as the buoyant force The buoyant force acts in the direction opposite to the force of gravity, so it makes an object feel lighter

maylin
Download Presentation

11.2

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. 11.2 Floating and Sinking

  2. Buoyancy • When you pick up an object underwater it seems much lighter due to the upward force that water and other fluids exert known as the buoyant force • The buoyant force acts in the direction opposite to the force of gravity, so it makes an object feel lighter • Since the pressure of a fluid increases with depth, the upward pressure on the bottom of the object is greater that the downward pressure on the top, resulting in the buoyant force • The weight of a submerged object is a downward force • An object sinks if its weight is greater than the buoyant force • If the weight of the submerged object is equal to the buoyant force, the object floats

  3. Archimedes’ Principle • Submerged objects displace, or take the place of, a volume of fluid equal to its own volume • Archimedes, a Greek mathematician discovered a connection between the weight of a fluid displaced by an object and the buoyant force acting on it • Archimedes’ Principle states that the buoyant force acting on a submerged object is equal to the weight of the fluid the object displaces

  4. Density • The density of a substance is its mass per unit volume • By comparing densities, you can predict whether an object will float or sink in a fluid • An object that is more dense than the fluid in which it is immersed will sink • An object that is less dense than the fluid in which it is immersed will float • If the density of the object is equal to the fluid, it will float at a constant depth

  5. Changing Densities • Submarines are a prime example of changing densities • When a submarine dives, it takes on water increasing density and making its weight greater than the buoyant force • When a submarine surfaces, it releases water decreasing the density and making it weight less than the buoyant force

More Related