[Image of a closed system with heat and work flowing in and out]
Narrator: The first law of thermodynamics states that energy cannot be created or destroyed, only transferred or transformed. In this animation, we will see how this law applies to a closed system.
[The heat and work flows are animated to show how they affect the internal energy of the system]
Narrator: Heat is energy that flows from a hotter object to a colder object. Work is energy that is transferred by a force acting through a distance. In this animation, the heat and work flows are causing the internal energy of the system to change.
[The animation shows how the internal energy of the system is converted into work and heat]
Narrator: The first law of thermodynamics tells us that the total amount of energy in the universe is constant. This means that any energy that is lost by one object must be gained by another object. In this animation, we see how the internal energy of the system is converted into work and heat, and how these forms of energy are then transferred to other objects in the environment.
[The animation ends with a summary of the first law of thermodynamics]
Narrator: The first law of thermodynamics is a fundamental law of nature that has many applications in the fields of science and engineering. This law tells us that energy cannot be created or destroyed, only transferred or transformed.