ISOLATED SYSTEM:
We are often interested in the behavior of a collection of particles that interact only with each other. We can draw an imaginary boundary around the particles, but complications can arise if some of the particles experience net forces that originate outside the "system" boundary. In order to effectively study the interaction between particles, we must limit our focus to isolated systems of particles.
An isolated system is a collection of particles that can interact with each other but whose interactions with the environment outside the collection have a negligible effect on their motions.
For example, the molecule of a gas enclosed in a vessel can be considered an isolated system of interacting bodies. Gas molecules interact with each other and with the walls of their container. Other forces, such as those of the table holding up the container and the gravitational force, are considered to have a negligible effect on the motions of the molecules and container.
An isolated system is a collection of particles
that can interact with each other but whose interactions with the environment
outside the collection have a negligible effect on their motions.
We are often
interested in the behavior of a collection of particles that interact only with
each other. We can draw an imaginary boundary around the particles, but
complications can arise if some of the particles experience net forces that
originate outside the "system" boundary. In order to effectively
study the interaction between particles, we must limit our focus to isolated
systems of particles.
For example, the molecule of a gas enclosed in a vessel can
be considered an isolated system of interacting bodies. Gas molecules interact
with each other and with the walls of their container. Other forces, such as
those of the table holding up the container and the gravitational force, are
considered to have a negligible effect on the motions of the molecules and container.
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