Škola: 	Gymnázium, Brno, Slovanské náměstí 7
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Škola: Gymnázium, Brno, Slovanské náměstí 7 Šablona: III/2 – Inovace a zkvalitnění výuky prostřednictvím ICT Název projektu: Inovace výuky na GSN prostřednictvím ICT Číslo projektu: CZ.1.07/1.5.00/34.0940 Autor: RNDr. Bc. Miroslav Hruška

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Škola: Gymnázium, Brno, Slovanské náměstí 7

Šablona: III/2 – Inovace a zkvalitnění výuky prostřednictvím ICT

Název projektu: Inovace výuky na GSN prostřednictvím ICT

Číslo projektu: CZ.1.07/1.5.00/34.0940

Autor: RNDr. Bc. Miroslav Hruška

Tematická oblast: Gravitational field and motion of bodies (gravitační pole a pohyb těles)

Název DUMu: Centre of gravity

Kód: VY_32_INOVACE_FY.4.10

Datum: 15. 3. 2014

Cílová skupina: Žáci středních škol s CLIL výukou fyziky v angličtině

Klíčová slova: Centre of gravity, force of gravity, symmetry, axis

Anotace: Prezentace zavádí pojem těžiště


Gravitational field and motion of bodies

Gravitational field and motion of bodies

10. Centre of gravity


Match the de scription with the name
Match the description with the name

A rotation | B torque |

C addition | D couple of forces |

two opposite, non-colinear forces

moment of a force about an axis of rotation

motion where all points of the body revolve around the same axis

replacing several forces with one


True or false
True or false?

Couple of forces can be replaced with one force

Moment of a couple of forces does not depend on the position of the axis

A rigid body is a model of a liquid body

Torque is a scalar


Exercise
Exercise

  • Decompose the force F into parallel components

20 cm

30 cm

120 N

F


Centre of gravity of a body
Centre of gravity of a body

  • A body is composed of a huge number of particles

  • On the Earth each individual particle of the body is acted on by the force of gravity

  • The resultant of these forces of gravity is the force of gravity acting on the body

  • The point of action is called the centre of gravity (těžiště)


Centre of gravity
Centre of gravity

  • The point of action of the total force of gravity acting on a body (as a resultant of the forces of gravity acting on individual particles) is called the centre of gravity

  • http://www.youtube.com/watch?v=R8wKV0UQtlo 2:26

  • http://www.youtube.com/watch?v=ZrtZTlUHKr0 14:20

  • http://biomech.ftvs.cuni.cz/pbpk/kompendium/biomechanika/images/teziste.gif gif


Centre of gravity1
Centre of gravity

  • If a body is symmetrical, then the centre of gravity lies in the plane, on the axis, or at the centre of symmetry!

T


Problem
Problem

  • Find the centre of gravity of the figures (they consist of squares 10 by 10 cm)


That is all for now

That is all for now

Thank you for your attention


  • Materiál je určen pro bezplatné používání pro potřeby výuky a vzdělávání na všech typech škol a školských zařízeních. Jakékoliv další využití podléhá autorskému zákonu.

    Zdroje:

  • Bednařík, 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 Learner’s Dictionary of Current English. 5. vyd. Oxford: Oxford University Press, 1995. 1428 s. ISBN 0-19-431423-5


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