Kinematics

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• Škola Gymnázium, Brno, Slovanské námestí 7
• Šablona III/2 Inovace a zkvalitnení výuky
  prostrednictvím ICT
• Název projektu Inovace výuky na GSN
  prostrednictvím ICT
• Císlo projektu CZ.1.07/1.5.00/34.0940
• Autor RNDr. Bc. Miroslav Hruška
• Tematická oblast Gravitational field and
  motion of bodies (gravitacní pole a pohyb teles)
• Název DUMu Archimedess principle
• Kód VY_32_INOVACE_FY.4.16
• Datum 15. 4. 2014
• Cílová skupina Žáci stredních škol s CLIL
  výukou fyziky v anglictine
• Klícová slova Archimedess principle,
  hydrostatic pressure, hydrostatic pressure force,
  buoyant force
• Anotace Prezentace vysvetluje podstatu
  Archimédova zákona

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Gravitational field and motion of bodies

• 16. Archimedes principle

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Find the only correct answer
Pascals principle deals with the pressure A)
caused by an internal force acting on a liquid
in a closed container B) caused by an internal
force acting on a liquid in an open container C)
caused by an external force acting on a liquid
in a closed container
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Problem

• The large piston of a hydraulic device has got
  three times larger radius than the small one.
  How many times greater than the force acting on
  the small piston is the force acting on the large
  piston?

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Hydrostatic pressure

• We refer to the pressure caused by the forces of
  gravity acting on individual particles of a
  liquid as the hydrostatic pressure
• We refer to the pressure caused by the forces of
  gravity acting on individual particles of the air
  as the atmospheric pressure

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Hydrostatic pressure

• Hydrostatic pressure in a liquid of density ? at
  a depth of h is
• g is the acceleration due to gravity
• Hydrostatic pressure force acting on a plane
  surface of area S is

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Buoyant force (vztlaková síla)

• Buoyant force is the resultant of the hydrostatic
  pressure forces acting on a body immersed in a
  liquid

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Buoyant force Fvz
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Archimedes principle (Archimeduv zákon)

• Any object immersed in a liquid is buoyed up by
  a force equal to the weight of the liquid
  displaced by the object.
• Teleso ponorené do kapaliny je nadlehcováno
  vztlakovou silou, jejíž velikost se rovná
  velikosti tíhy kapaliny stejného objemu, jako je
  objem ponorené cásti telesa.

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The net force acting on the body

• The buoyant force Fvz
• The force of gravity FG
• What does the net force depend on?
• http//www.youtube.com/watch?vxniW3_afO-0
  Archim. principle 059

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That is all for now

• Thank you for your attention

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• Materiál je urcen pro bezplatné používání pro
  potreby výuky a vzdelávání na všech typech škol a
  školských zarízeních. Jakékoliv další využití
  podléhá autorskému zákonu.
• Zdroje
• Bednarík, M., Široká, M. Fyzika pro gymnázia,
  Mechanika. Dotisk 3. vyd. Praha Prometheus,
  2004. 288 s. ISBN 80-7196-176-0
• Hornby, A. S. Oxford Advanced Learners
  Dictionary of Current English. 5. vyd. Oxford
  Oxford University Press, 1995. 1428 s. ISBN
  0-19-431423-5