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Eins der fundamentalsten Konzepte in der Physik

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ist die "Arbeit".

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Am Anfang wird einem vermittelt, dass dies

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einfach das Ergebnis der Formel "Kraft-mal-Strecke" ist.

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Aber wenn man Vektoren kennen lernt, dann

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stellt man fest, dass eine Kraft nicht immer in die

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gleiche Richtung wie die Verschiebung gerichtet ist.

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Man lernt dann, dass Arbeit eigentlich die Größe

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einer Kraft in Richtung, oder besser gesagt

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der Komponente einer Kraft in Richtung der

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Verschiebung

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- Verschiebung besteht dabei aus Abstand und Richtung -

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mal die Größe der Verschiebung,

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beziehungsweise, "mal Strecke" ist.

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(Arbeit = Kraftkomponente x Strecke)

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Ein klassisches Beispiel:

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Angenommen, man hat einen Block aus Eis oder so,

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ich sag einfach mal Eis damit wir Reibung vernachlässigen können,

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und der Block ist auf 'nem gefrorenen See.

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Wir ziehen dann in einem Winkel an dem Block.

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Sagen wir mal so ein Winkel hier.

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Das ist die Zugkraft.

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Die Zugkraft ist... also das

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ist mein Kraftvektor.

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Sagen wir mal, der Kraftvektor

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hat einen Betrag von 10 Newton.

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Und sagen wir mal, die Richtung

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des Vektors

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hat 30 Grad... besser 60 Grad

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über der Horizontalen.

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Das ist also die Richtung, [br]in die gezogen wird.

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Angenommen, der Block wird[br]dadurch verschoben.

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Hoffentlich ist das für euch[br]nur Wiederholung.

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Wenn man den Block jetzt verschiebt, [br]angenommen um 5 Newton.

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