PS2.A: Forces and Motion

Paul Andersen introduces forces, motion, and Newton's three laws in this video.  He begins by describing forces as pushes or pulls on objects that produce motion.  A lack of motion results from a balanced set of forces.  A teaching progression K-12 is also included.

CCC4: Systems and System Models

In this video Paul Andersen explains how systems can be used to understand phenomenon in science and create better designs in engineering.  He starts by defining the characteristics of a system and describes how system models can be used to better understand the world.  For example a system model of the water cycle can show the cycling of matter on the surface of the Earth.  He ends with a progression of instruction for a K-12 science classroom.

SEP6: Constructing Explanations and Designing Solutions

Paul Andersen explains how scientists modify theories by constructing explanations.  He also discusses the cycle of design used by engineers to solve problems.  He starts by defining a theory as a well-established explanation of a phenomenon that is refined over time.  Examples discussed in the video include the big bang theory, the germ theory and the theory of natural selection.  He also lays out a progression for building this skill in students.