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.

CCC7: Stability and Change

Paul Andersen explains how stability and change are regulated in systems through controls and feedback.  Controls are used to regulate matter and energy flowing into a system.  Feedback mechanisms within the system are used to regulate stability.  Negative feedback loops keep the values around a set point and positive feedback loops move them away.  Disequilibrium can result in death of living systems and destruction of physical systems.  A progression of instruction for K-12 students is also included. 

SEP3: Planning and Carrying Out Investigations

Paul Andersen explains how investigations are used by scientists to answer questions and by engineers to test designs.  He delineates be investigative and observational science.  He demonstrates the formation of a good question the design of an effective investigation.