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 Hydrostatics pressure in fluids
• Kód VY_32_INOVACE_FY.4.14
• Datum 4. 4. 2014
• Cílová skupina Žáci stredních škol s CLIL
  výukou fyziky v anglictine
• Klícová slova Fluid, liquid, gas, pressure
• Anotace Prezentace zavádí pojem tekutina a
  fyzikální velicinu tlak

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Gravitational field and motion of bodies

• 14. Hydrostatics pressure in fluids

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Fill in the gaps I
rigid body

• A body is of a huge number of particles
  (n)
• When a body is moving, each individual particle
  has its own energy
• If a rigid body is in translation, all particles
  have equal
• If a rigid body is in rotation, all particles
  have equal

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Fill in the gaps I solution
rigid body

• A body is composed of a huge number of particles
  (n)
• When a body is moving, each individual particle
  has its own kinetic energy
• If a rigid body is in translation, all particles
  have equal velocities
• If a rigid body is in rotation, all particles
  have equal angular speeds

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Fill in the gaps II
rigid body

• Moment of of a body, about a given ,
  describes how the matter is in the body
  with respect to the given
• Moment of of a body is a characteristic of
  the body and the given
• J

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Fill in the gaps II solution
rigid body

• Moment of inertia of a body, about a given axis,
  describes how the matter is distributed in the
  body with respect to the given axis
• Moment of inertia of a body is a characteristic
  of the body and the given axis
• J kg.m2

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Excercise
rigid body

• A disk of mass 1 kg and radius 0.2 m rotates with
  a frequency of 10 Hz. Find its rotational kinetic
  energy. Moment of inertia of a disk of radius R
  and mass m is

Solution

• The moment of inertia is 0.02 kg.m2
• The angular speed is 62.8 rad.s-1
• The rotational energy is 39.4 J

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Fluids

• Liquids gases fluids (tekutiny)
• Hydrostatics deals with liquids at rest
• Hydrodynamics studies liquids in motion
• Aerostatics deals with gases at rest
• Aerodynamics studies gases in motion

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Model of an ideal liquid

• perfectly (completely) incompressible (dokonale
  (zcela) nestlacitelná)
• perfectly fluid non-viscous (dokonale tekutá
  bez vnitrního trení)

Model of an ideal gas

• perfectly compressible (dokonale stlacitelný)
• perfectly fluid non-viscous

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Pressure

• The state of a fluid can be characterized by
  pressure
• F the magnitude of a normal force
• S the area that is acted by the normal force
  (perpendicularly)
• Pressure is a scalar quantity
• p pascal Pa N/m2
• Blaise Pascal (16231662)

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The state quantities

• The state of a fluid can be characterized by
  other quantities, such as temperature, volume,
  mass, density, energy
• These quantities are called the state quantities
  (stavové veliciny)
• http//www.youtube.com/watch?vo9lwghOHL5E
  atmospheric pressure 338
• http//www.youtube.com/watch?vOjqNdk3dnng Bill
  Nye- Pressure 2308

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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