Question

Why do Boomerangs Come Back?

Answer 1

The reason why a boomerang comes back is due to a phenomenon known as gyroscopic precession.

When a boomerang is thrown, the top wing is moving faster through the air as compared to the bottom wing, because the top wing is moving in the direction of the throw, while the bottom wing is moving in the opposite direction. As a result, the top wing will generate more lift than the bottom wing. The difference in the lift between the top and the bottom wing creates a torque. It is this torque that makes the boomerang tilt and gradually return to the thrower.

Answer 2

It is because the throw of the boomerang gives it an angular velocity perpendicular to its path.