When we think of machines, the likes of robots, appliances and manufacturing equipment come to mind, but scientists also classify such common objects as the screw, the lever, the wedge and the wheel ...

The film *Spinning Levers* explores the fundamental mechanics of levers and gears, illustrating their role in various everyday applications and in the complex workings of a car’s transmission.

Discusses the principles of levers, a type of simple machine that helps lift heavy loads by changing the direction or magnitude of force applied. It explains how the position of the fulcrum affects ...