A boomerang has at least two wings combined in one unit. It makes a boomerang spin about a central point, stabilising its motion as it flies through the air.
The wings are set at a slight tilt. They have an airfoil design - rounded on one side and flat on the other - which gives a wing lift. The wing has lift when the air particles move quicker over the top of the wing than the bottom, which creates a difference in air pressure, causing lift.
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Aborigines of Australia are credited with the invention of the boomerang. They used non-returning boomerangs in hunting, called kylies.
The returning boomerang might be a complete accident or the result of design experimentation. The Aborigines perfected the boomerang design and throwing technique for the simple pleasure of it.
The two wings of a boomerang are arranged so that the leading edges are facing in the same direction, like propeller blades. Propellers create a forward force by spinning the blades.
If you throw a boomerang, as you do with a Frisbee, you may assume the forward motion would be up, and the boomerang would fly up until it stopped spinning and gravity pulled it down again. If you held it vertically when you threw it, as is proper, it seems that it would fly off to the right or left. But that is not what happens.
Returning boomerangs are the banana-shaped devices that come back to you when you throw them.
The returning boomerangs are made from lightweight pieces of wood, plastic or similar material and generally measure 1 to 2 feet (30 to 60cm) across. When thrown correctly, a returning boomerang flies in a circular path and returns to its starting point.
When you throw the boomerang:
Non-returning boomerangs are effective hunting weapons. They are easy to aim and can travel a longer distance at a high rate of speed.
These boomerangs are made from pieces of wood shaped in a curve, but they are usually heavier and longer than the returning boomerang, about 3 feet (1 metre) across. The design helps them cut through the air.
There are five variables involved in a boomerang flight:
All five forces have to be balanced to make a boomerang travel in a circle and come back to its starting point. The only way to consistently make good throws is to practice good technique.
Planes can fly quite easily without engines, as gliders (planes without engines), paper planes, and gliding birds show us.
A plane's engine is designed to move the plane forward at high speed. The wings move a plane upward. At high speed, the air flows fast over the wings and throws the air down toward the ground, generating an upward force, or lift. The upward force overcomes the plane's weight and keeps it in the sky.
Record albums are analog, the closest thing we have to the soundwaves. These waves are drawn out of a flattened, spinning disk of vinyl by a diamond. The diamond is physically taking a ride on the record. The bumps in the grooves push the diamond up and down.
Ask a record-collecting audiophile why vinyl is back, and you may hear a reply about sound quality. But it is much deeper than that. The form of the medium becomes part of the message it would convey and influences how the message is viewed.
The assumption that the Earth can stop spinning is far-fetched. But, what if something changed the Earth's rotation? Let's assume the Earth stopped spinning gradually.
And let's suppose that Earth's ecosystems have survived the transition. What would the new world look like?
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