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<\/figure>\n\n\n\nOn mesure ensuite l’allongement du ressort en fonction du poids suspendu.<\/p>\n\n\n\n Le rapport F\/x est constant, c’est la loi de Hoole:<\/p>\n\n\n\n F=-kx<\/p>\n\n\n\n Les \u00e9l\u00e8ves ont travaill\u00e9 de mani\u00e8re assidue et on pu tracer une jolie droite pour la fonction F(x). Ensuite, nous avons mesur\u00e9 la p\u00e9riode d’oscillation en fonction de la masse suspendue. Cette fois, on n’obtient pas une droite mais une courbe. Par contre, si l’on choisi le carr\u00e9 de la p\u00e9riode en fonction de la masse, on obtient de nouveau une droite. La raison en est que la p\u00e9riode d\u00e9pend de la racine de la masse:<\/p>\n\n\n\n T=2 \u03c0 \u221a(m\/k)<\/p>\n\n\n\n Les \u00e9l\u00e8ves ont remarqu\u00e9 que la fr\u00e9quence d’oscillation diminue avec la masse, et que cette diminution devient plus faible avec l’augmentation de la masse.<\/p>","protected":false},"excerpt":{"rendered":" Pour la p\u00e9riode sur les ondes avec la 12\u00e8me classe, nous avons fait des exp\u00e9riences avec des ressorts. C’est simple et on obtient de bons r\u00e9sultats. Loi de Hooke On suspend un ressort et on fixe une r\u00e8gle \u00e0 c\u00f4t\u00e9, de sorte que l’extr\u00e9mit\u00e9 du ressort soit sur le z\u00e9ro et que la graduation aille 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<\/figure>\n\n\n\n