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		<rdfs:label>Ballon à réaction</rdfs:label>
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		<property:Description rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Découvrir la force de l'air</property:Description>
		<property:Difficulty rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Easy</property:Difficulty>
		<property:Disciplines_scientifiques rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Mechanics</property:Disciplines_scientifiques>
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		<property:Explanations rdf:datatype="http://www.w3.org/2001/XMLSchema#string">On retrouve ici un principe d’action-réaction, l’air qui est expulsé du ballon est “l’action”.

En s’échappant du ballon l’air produit une force contre l’air ambiant. Imagine simplement qu’elle pousse l’air, comme tu pousserais un objet.

Comme le dit [https://fr.wikipedia.org/wiki/Isaac_Newton &lt;u&gt;Newton&lt;/u&gt;] cette force s’exerce également dans le sens opposé. C’est-à-dire que l’air ambiant pousse le ballon. Le ballon étant libre de bouger il se déplace le long de la ficelle, c’est la “réaction” !

C’est le principe des avions à réaction. Les réacteurs, fixés sous les ailes expulsent de l’air et du kérosène brûlé à grande vitesse vers l’arrière, ce qui fait avancer l’avion.</property:Explanations>
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		<property:Main_Picture rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Le_d_fi_de_la_nasa_bolide.jpg</property:Main_Picture>
		<property:Observations rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Lors de la libération de l'air contenu dans le ballon, ce dernier avance tout seul le long du fil.</property:Observations>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Préparation du matériel :

- une paille

- un ballon de baudruche

- une pince à linge

- 5 mètres de ficelle

- du ruban adhésif</property:Step_Content>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Gonfler le ballon, plus il sera gonflé plus il ira vite et loin.

Fermer le ballon avec la pince à linge.

Fixer la paille sur le ballon avec le ruban adhésif dans le sens de la longueur (de l'embout de gonflage à l'extérmité).</property:Step_Content>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">* Enfiler la ficelle dans la paille et tendre la ficelle entre deux points fixes, par exemple deux chaises, ou bien une chaise et une poignée de fenêtre.
* Retirer la pince à linge et le bolide va être propulsé. Le ballon est même capable de monter si la ficelle est en pente.</property:Step_Content>
		<property:Step_Title rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Rassemble le matériel</property:Step_Title>
		<property:Step_Title rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Prération du bolide</property:Step_Title>
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