The diagrams show two examples of balanced objects where there is no rotation. A ball at the bottom of a trough A balanced see-saw For a balanced object, the size of a force, or the perpendicular ...

This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. Zoltan Fodor, Professor of Physics, Penn State When ...

As one gear turns, the other gear must also turn. Where the gears meet, the teeth must both move in the same direction. In the diagram, the teeth of both gears move upwards. This means that the gears ...