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    Floating and Sinking

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    yashna.bhandari
    The Titanic sank because its weight exceeded the buoyant force of the water. Buoyancy is the upward force exerted by fluids on immersed objects due to higher pressure on the bottom of the object. An object floats if its weight is less than the buoyant force and sinks if its weight is greater. An object's density determines whether it floats or sinks - less dense objects float while more dense objects sink.

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    Floating and Sinking

    Uploaded by

    yashna.bhandari
    42 views15 pages
    The Titanic sank because its weight exceeded the buoyant force of the water. Buoyancy is the upward force exerted by fluids on immersed objects due to higher pressure on the bottom of the object. An object floats if its weight is less than the buoyant force and sinks if its weight is greater. An object's density determines whether it floats or sinks - less dense objects float while more dense objects sink.

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    The Titanic sank because its weight exceeded the buoyant force of the water. Buoyancy is the upward force exerted by fluids on immersed objects due to higher pressure on the bottom of the object. An object floats if its weight is less than the buoyant force and sinks if its weight is greater. An object's density determines whether it floats or sinks - less dense objects float while more dense objects sink.

    Copyright:

    © All Rights Reserved
    Download as PPT, PDF, TXT or read online from Scribd
    Download as ppt, pdf, or txt
    42 views15 pages

    Floating and Sinking

    Uploaded by

    yashna.bhandari
    The Titanic sank because its weight exceeded the buoyant force of the water. Buoyancy is the upward force exerted by fluids on immersed objects due to higher pressure on the bottom of the object. An object floats if its weight is less than the buoyant force and sinks if its weight is greater. An object's density determines whether it floats or sinks - less dense objects float while more dense objects sink.

    Copyright:

    © All Rights Reserved
    Download as PPT, PDF, TXT or read online from Scribd
    Download as ppt, pdf, or txt
    of 15

    Floating and Sinking

    The Titanic

    What do you know about the Titanic?

    How is it possible that a huge ship can easily


    float in water under certain conditions and
    then in a few hours become a sudden
    wreck?
    Buoyancy!!
    Buoyancy

    Water exerts a force called a buoyant force


    that acts on a submerged object.

    The buoyant force acts in the upward


    direction, against the force of gravity, so it
    makes an object feel lighter.
    Buoyancy
    As you can see in the picture, a
    fluid exerts pressure on all
    surfaces of a submerged
    object. Since the pressure in a
    fluid increases with depth, the
    upward pressure on the bottom
    of the object is greater than
    the downward pressure on the
    top. The result is a net force in
    the upward direction. This is
    the buoyant force.
    Submerged Objects
    Submerged objects take the
    place of a volume of fluid
    equal to it’s own volume.

    Objects that float on top of


    the water only take the
    place of the volume of fluid
    equal to the volume of the
    amount of the object in the
    fluid.
    Archimedes’s Principle
    Archimedes’s Principle
    relates the amount of fluid a
    submerged object displaces
    to the buoyant force on the
    object.
    Archimedes’s Principle states
    that the buoyant force on an
    object is equal to the weight
    of the fluid displaced by the
    object.
    Floating and Sinking
    There is always a downward
    force in a submerged object,
    the object’s weight.
    If the weight of the object is
    greater than the buoyant
    force, the net force on a
    submerged object will be
    downward and the object will
    sink.
    Sinking and Floating

    The object will only


    sink deep enough to
    displace a volume of
    fluid with a weight
    equal to its own. At
    that point, it will stop
    sinking deeper and
    will float.
    Floating and Sinking

    If the weight of the object


    is less than the buoyant
    force, the object will
    float.

    If the weight of the object


    is exactly equal to the
    buoyant force, the two
    forces are balanced.
    Density
    The density of a substance is its mass per
    unit volume.
    Density = Mass
    Volume

    An object that is more dense than the fluid in


    which it is immersed sinks. An object that
    is less dense than the fluid in which it is
    immersed floats to the surface.
    Density

    If the density of an object is equal to the


    density of the fluid in which it is
    immersed, the object neither rises nor
    sinks in the fluid.
    Densities of Substances
    Densities of Substances
    Changing the density of an object can make
    it float or sink in a given fluid. For
    example, submarines change their density
    by pumping water out of it’s floatation
    tanks. The mass of the submarine
    decreases but the volume remains the
    same.
    Buoyancy and Density
    Another way to change density is to change
    the volume.
    Ships

    The shape of a ship causes it to displace a


    greater volume of water than a solid piece
    of steel of the same mass. The greater
    the volume of water displaced, the greater
    the buoyant force. A ship stays afloat as
    long as the buoyant force is greater than
    its weight.

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