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Education
®
Pour les versions d’imprimante des expériences, aller à : www.knex.com/instructions et entrez le code 79319.
11
Objectifs : Enquêter sur la façon
dont la proximité de la résistance du
point d’appui affecte l’effort nécessaire
pour atteindre un état d’équilibre.
Matériaux dont vous aurez
besoin :
PROCESSUS :
1. Construisez le modèle de BALANCE en suivant les
instructions étape-par-étape.
Expérience # 1
Equilibrer la Balance
79319
le modelé de la BALANCE
10 rondelles ou petits trombones
Les petits autocollants ou des
morceaux de ruban adhésif
Un petit objet comme un clip de liant,
une gomme ou un morceau de craie
papier ou bloc-notes
règle
2. L’utilisation de petits
autocollants ou des
morceaux de ruban
adhésif, d’identifier le
point d’appui, la charge
et l’effort du modèle
d’équilibre.
3. Identifier la classe de
levier le solde appartient
à et pourquoi.
a. Retirez les plateaux gris (roues de poulie gris) du
modèle. Poussez les cintres rouge et orange à
l’extrémité des bras d’équilibre. Une fois que les
deux bras sont stationnaires, observer et décrire,
en utilisant le vocabulaire correct, ce que le
modèle est en train de faire.
b. Qu’est-ce qui se passe quand une extrémité du
modèle est donné une petite poussée / a une
force appliquée? Expliquez vos observations.
c. Pourquoi l’équilibre reste stationnaire, ou au
repos, jusqu’à ce qu’une force agit sur elle ?
(
FR
)
Français
point d’appui
charge
effort
11


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