Here is a tri-faceted resource that has a slide show, a quiz, and a vocabulary list that you can use to teach simple machines. Six machines are introduced: wheels and axles, planes, levers, pulleys, wedges, and screws. Slides contain...

In this online interactive philosophy worksheet, students respond to 10 short answer and essay questions about Galileo's contributions to science. 

Identify the six simple machines by dragging the correct term, and dropping it onto the associated simple machine.

The six types of simple machines are explained clearly through pictures, text and videos.

This site, in German, offers numerous apps that illustrate common physics principles. Apps are organized into categories: mechanics, oscillations and waves, electrodynamics, optics, thermodynamics, the theory of relativity, physics of...