Resources for STEM Teachers and Students


A Free Web based Personal Response System

Flip your classroom and have students voting
in less than one minute at zero cost! is a free web based personal response system, or web clicker, that works on any internet accessible devices (phones, pads, PCs, Laptops) with a working browser. Designed and developed by teachers and education researchers, it is a product for your classroom in schools or online, built for effectiveness, convenience, and flexibility. It is totally free for everyone to use the system. There are no hardware purchases, no app downloads, and absolutely no cost!


Free Online Physics Homework and Study Help

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Physics Homework and Study Help at, where students can ask questions and receive help on learning physics. We currently focus on helping questions in introductory level college physics and high school AP Physics courses. The system provides advanced features such as rich format text, picture uploads, and latex and mathML equation renderings.  

See a sample question and answer page below:

Lei Academy Physics Homework and Study Help