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.

Most fuel in gas-powered vehicles is wasted as heat, but a new study reveals a way to convert this lost energy into ...

The human race has been reaching for impossible dreams of perpetual motion and free energy for just about all ... the electrolysis of water, will power cars. An unmodified carbureted gasoline ...