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• JelängerderLastarmist,destomehrKraftbrauchtman,umdieLastzubewegen,sie
bewegt sich aber weiter und schneller (Das Katapult, das oben besprochen wurde, ist ein Beispiel
dafür.)
Fig. 5
Kraft
Last
Drehpunkt
Beispiele für zweiseitige Hebel:
Wippe, Brechstange; der Nagelheber eines Zimmermannshammers; Ruder an einem Ruderboot;
Schere (zwei verbundene zweiseitige Hebel).
Eine Schere ist ein Beispiel für zwei
zweiseitige Hebel die zusammen arbeiten.
Beim Zusammendrücken der beiden Griffe, wird
Energie erzeugt, das Gelenk ist der Drehpunkt,
und der Widerstand des Materials, das geschnitten
werden soll, ist die Last. Beachte, dass die stärkste
Schneidkraft in der Nähe des Drehpunkts liegt. Die
Pfeile zeigen die Richtung der Kräfte an.
Eine Brechstange ist
ein Beispiel für einen
zweiseitigen Hebel.
Fig. 6
L KD
Einseitiger Hebel.
Eigenschaften:
1. Der Widerstand oder die Last wirkt zwischen der Kraft und dem Drehpunkt. Oder anders: Der Drehpunkt
liegt an einem Ende der starren Stange.
L
K
D
EINFÜHRUNG EINFACHE MASCHINEN
Education
®
10


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