generally confirm the existence of a non-contact friction force between surfaces separated by very small distances. What's behind it? As with many mysteries of physics, this one seems to have ...

Science presenter Jon Chase explains friction. He describes how friction opposes or prevents motion, and demonstrates the force in action with an experiment involving two interleaved books.

By refining an artificial intelligence approach to predicting earthquakes in the laboratory, or labquakes, engineers at Penn ...

Friction is a force that opposes motion. It is present whenever two surfaces rub over each other, such as when you rub your hands together, or when you apply the brakes on a bike or in a car.