3-3 Floating & Sinking.

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Presentation transcript:

3-3 Floating & Sinking

Buoyancy Water exerts a buoyant force that acts in an upward direction against gravity, so it makes an object feel lighter. A submerged object displaces a volume of fluid equal to its own volume.

Archimedes Principle The buoyant force on an object is equal to the weight of the fluid displaced by the object. If the weight of the object is greater than the buoyant force = net force is downward & object sinks If the weight of the object is less than the buoyant force = net force is upward & object floats

Density D = M/V If object is more dense than the fluid, it will sink If object is less dense than the fluid, it will float If object’ density = fluid’s density, it will hover

Buoyancy & Density The shape of a ship (greater volume than a hunk of steel) causes it to displace a greater volume of water. This makes for a greater buoyant force. A ship stays afloat as long as the buoyant force is greater than its weight.