Physics

Teaching

Demo

First Lawand

of

Presented by:Melchor J. Potestas

Physics

Teaching

Demo

First Lawand

of

Presented by:Melchor J. Potestas

Review• Thermodynamics

- can be defined as the science of energy.

• Energy - can be viewed as the ability to cause changes.

Review

Law of Conservation of Energy- states that during an interaction,

energy can change from one form to another but the total amount of energy remains constant.

First Law of Thermodynamics

First Law of Thermodynamics

• The First Law states that energy cannot be created nor destroyed; rather, the amount of energy lost in a steady state process cannot be greater than the amount of energy gained.

First Law of ThermodynamicsExample

Figure 1. Conservation of Energy for the Human Body

First Law of Thermodynamics

• The change in internal energy of the system during any thermodynamic process depends only on the initial and final states, not on the path leading from one to the other.

Second Law of Thermodynamics

“Heat can spontaneously flow from a higher-temperature region to a lower-temperature region, but not the other way around."

Second Law of Thermodynamics

Where:ΔS - change in entropyΔQ – change in heatT - Period

Example

Figure 2. Heat flows in the direction of decreasing temperature.

Thank You!!!