Science Education Resource Center at Carleton College
Serc: Investigating Newton's 3rd Law: Coin Flick
In this elementary physics investigation, young scholars explore Newton's 3rd Law of Motion: To every action there is an equal & opposite reaction. Pairs of students will line up 5 pennies, (touching each other), between 2 rulers....
PBS
Pbs Kids "Zoom": Rube Goldberg Machine Building
This site from PBS Kids "Zoom" provides great ideas for building a Rube Goldberg machine around the house from common items. The information is complete with materials needed, instructions, and results on a level for elementary kids.
University of Kentucky
University of Kentucky: Online Physics for Teachers
A set of four online courses in Physics for elementary and middle school teachers. Each course targets a different topic area - light, electricity & magnetism, temperature & heat, and force, motion, & energy.