Object Interactions Bozeman Science English French

Object InteractionsYouTube↗ IA↗(long shot)
Education 6.9K views 56 likes 0 dislikes 04 Feb 2015

Bozeman Science 1.4M subscribers N/A YouTube↗

Hi. It’s Mr. Andersen and this is AP Physics essentials video 77. It is on object interactions.

Salut. C'est M. Andersen et c'est le 77e vidéo pour AP Physique. On va parler des interactions des objets.

Remember in the last video we talked about systems and how systems in physics could either

Rappelez-vous que dans la dernière vidéo nous avons parlé des systèmes et comment les systèmes de physique peuvent être des

be closed physical systems or open physical systems. An open physical system is when we

systèmes physiques fermés ou des systèmes physiques ouverts. Un système physique ouverte est lorsqu'on

are either taking in or we are removing matter or energy. And the taking in or the removal

met ou enlève de la matière ou de l'énergie. Et la prise ou l'enlèvement

of matter or energy is called an interaction. And so a system is a series of two or more

de la matière ou de l'énergie est appelé une interaction. Et donc, un système est une série de deux ou plus

objects that are separated from their environment. But if we have an object outside of that system

objets qui sont séparés de leur environnement. Mais si on a un objet dehors de ce système

that is either applying matter of energy into or out of that system, we call that an interaction.

qui applique l'énergie de la matière dans ou hors de ce système, on appelle ça une interaction.

And so systems remember can be closed or open. In an open system we can move matter in or

Et donc les systèmes peuvent être fermés ou ouverts. Dans un système ouvert, on peut y mettre ou en enlever de la matière.

out. But how do we really close a system? How do we make sure that there is no matter

Mais comment est-ce qu'on peut véritablement fermer un système? Comment est-ce qu'on peut s'assurer qu'il n'y a pas de matière

or energy either going into or out of, let’s say, this cardboard box right here? Well if

ou l'énergie entrant ou sortant, supposons, de cette boîte en carton ici? Eh bien, si

I do not want matter coming in I could wrap the whole thing in plastic. But now heat is

Je ne veux pas que la matière y entre, je peux envelopper le tout dans le plastique. Mais maintenant, la chaleur sera

going to be able to get in. So I could put styrofoam around the whole thing. But now

capable d'y entrer. Donc je pourrais mettre du polystyrène autour de la chose. Mais maintenant

we could push on it, so forces could act on it. So we could put brick around that and

on peut y pousser sur elle, donc les forces peuvent agir le sur. Donc, on peux mettre des briques autour de cela et

put steel around that. But we would still have radiation going in and out. So we might

mettre de l'acier aussi. Mais nous aurions encore du rayonnement entrant et sortant. Donc, nous pourrions

wrap the whole thing in lead. But we are still never going to be able to isolate that system

envelopper tout ça dans le plomb. Mais encore, on ne sera jamais capable d'isoler ce système.

from the environment. And so in physics what we try to do is choose a system, appropriately,

de l'environnement. Et en physique ce qu'on essaie de faire est de choisir un système, de manière appropriée,

we simplify the situation or simplify the system so we can minimize the amount of interactions

nous simplifions la situation ou de simplifier le système afin qu'on puisse réduire la quantité des interactions

in or out. But if we do then we simply measure what those interactions are. And systems are

entrant ou sortant. Mais si on en a, on peut tout simplement mesurer ce que ces interactions sont. Et les systèmes sont

going to be important not only in physics but in chemistry, if we are looking at gases

importants, non seulement en physique, mais dans la chimie, si on fait attention aux gaz,

for example, moving around. Or in biology we could think of a tree as a system itself.

par exemple, se déplaçant. Ou en biologie on peut considérer un arbre comme un système lui-même.

And how do we minimize interactions into or out or at least measure those. And so did

Et comment est-ce qu'on peut minimiser les interactions entrant ou sortant, ou au moins les mesurer. Et alors

you learn that an interaction transfers matter or energy into or out of a system? I hope

est-ce que vous avez appris que une interaction peut transférer du la matière ou d'énergie dans ou hors d'un système? J'espère.

so. And I hope that was helpful.

Et je espère que c'était utile.

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