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Škola: Gymnázium, Brno, Slovanské náměstí 7

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

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  1. 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

  2. Gravitational field and motion of bodies 10. Centre of gravity

  3. 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

  4. 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

  5. Exercise • Decompose the force F into parallel components 20 cm 30 cm 120 N F

  6. 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)

  7. 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

  8. 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

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

  10. That is all for now Thank you for your attention

  11. 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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