American Association of Physics Teachers
Com Padre Digital Library: Open Source Physics: Falling Slinky Model
A model of a slinky consisting of a string of twenty masses connected by springs. When the slinky is released, it falls and retracts in a series of movements. The motion of the slinky can be explored by moving the masses to different...
Exploratorium
Exploratorium: Structures Around the World
How does that bridge stay up? What are the forces acting on that column? This site helps students understand how structures can be built by having them build their own. Also provides images of real structures for kids to compare with...
Physics Classroom
The Physics Classroom: Newton's First Law of Motion
A clear explanation of Newton's First Law of Motion, the law of inertia, with diagrams and real-world examples. Useful for both students and teachers. Written by a high school physics teacher.
Khan Academy
Khan Academy: What Is Tension?
What is tension? How do you calculate tension? This site will review over how ropes pull on things and how to handle that kind of force.
Khan Academy
Khan Academy: What Is Normal Force?
If you have ever run into a solid wall, you have experienced the pain of a normal force. This webpage reviews over the force exerted when two objects touch.