why do boomerangs come back?

Answer 1

cuz they can

Answer 2

Copied from Wikipedia:
A returning boomerang is a propeller. Though it is not a requirement that the boomerang be in its traditional shape, it is usually flat. A falling boomerang starts spinning and most then fall in a spiral. When the boomerang is thrown with high spin, the wings produce lift. Larger boomerangs are used in hunting, thus they drop on the ground after striking the target. Smaller ones are use in sport, and are the only boomerangs that return to the thrower. Because of its rapid spinning, a boomerang flies in a circular pattern rather than a straight line. It naturally returns to its starting point unless all spin is eaten up.

Now in more detail:

Returning boomerangs consist of two or more arms or wings, connected at an angle. Each wing is shaped as an airfoil, air travels faster over one surface of an airfoil than the other, as it follows the longer path, thus creating lift, along what is roughly a plane which intersects the airfoil at a near right angle along the long axis of the wing.

These wings are set so that the lift created by each wing opposes the lift of the other, but at an angle such that the flight pattern is constantly shifted as the forces of lift, drag, speed, rotational inertia etc. 'attempt' to reach equilibrium, see Boomerang engineer.

This is what makes the boomerang 'return gracefully to the thrower, fluttering to a stop in his hand'... when thrown correctly. This is also what makes the boomerang 'rocket straight up into the air before plunging to its shattered doom'... when thrown incorrectly. With the exception of long-distance boomerangs, they should not be thrown sidearm or like a frisbee, but rather almost vertically.

Answer 3

I'm not sure why this is in cooking and recipes but...

A boomerang's shape makes it travel a curved path (so a circle) and it returns.

Howver, there are other kinds of boomerangs that don't return. Here's a good wiki article.

Answer 4

simple physics, the structure of the boomerang
(it's slight curve upward and side ward) makes the wind passing through it force the boomerang to take a direction (circular) and then there it goes back to where it was thrown, to you.

Answer 5

Magic! ;)

No, really, it's because the shape of the thing makes it fly in a circle, so it gets back to where it started. If the shape were a little off, it might kind of come back but not quite make it all the way, or just fly off to one side or something, but if it's right, it makes a perfect circle.

Answer 6

Aero-dynamics.

Answer 7

look it up

Answer 8

because they like you ???