Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Pete Rathburn is a copy editor and ...

In this video, Jonny Nelson introduces an animated explanation of moments, levers and gears. Turning forces are found in many everyday situations and are essential for machines to function. Levers and ...

Jonny Nelson explains how energy can be described as being in different ‘stores.’ Energy cannot be created or destroyed but it can be transferred, dissipated or stored in different ways.