Physics 4 Kids is a great resource packed full of basic lessons covering different key concepts of physics. You can use this resource to expand students knowledge of physics and to also initiate them to those physics concepts you are planning to teach them in class. Physics 4 Kids provides students with guided tours that they can use by themselves to learn about physics. To make things easier, the site embeds visual aids and video tutorials to enhance students understandings. Some of the core physics ideas the site covers include: motion and mechanics, electricity and magnetism, modern physics, light and optics and many more.
PHYSICS4KIDS is one of many free science sites developed by the team at the Kapili Islands. It has also developed some other interesting sites such as Chem4Kids, Geography4Kids, Biology4Kids, Cosmos4Kids, NumberNut.com.