PS1.A: Structure and Properties of Matter

In the first physical science video for the Next Generation Science Standards Paul Andersen explains the structure and properties of matter.  He starts by explaining how all matter is made of about 100 smaller particles called matter.  He explains a teaching progression for introducing the topic of matter K-12.  This begins with a brief introduction to substances that can be scientifically observed at many levels.  This eventually builds through molecules and pure substances to the subatomic structure of atoms and the importance of binding energy.
 

CCC3: Scale, Proportion, and Quantity

In this video Paul Andersen explains the importance of scale in science and engineering.  The Universe varies in size along three scales: size, timespan, and energy.  Many phenomenon are too small and fast, or two large and slow to observe.  We use the tools of proportion and units of measure to comprehend different scales.  The video ends with a progression of instruction from K-12

SEP2: Developing and Using Models

Paul Andersen explains the importance of modeling in science and engineering.  Models are used by scientists to explain phenomenon.  Unlike mental models, conceptual models can be shared by all scientists to improve our understanding of the Universe.  Engineers use models study systems and test designs.