Skip to main content

Why do Boomerangs Come Back?

By


Boomerangs work on the same principles of aerodynamics as any other flying object; the key to how a boomerang works is the airfoil.
An airfoil is flat on one side but curved on the other with one edge thicker than the other - this subjects the boomerang to lift, keeping it in the air. The lift is generated because the air flowing up over the curve of the wing has further to travel than the air flowing past the flat side. The air moving over the curve travels faster in order to reach the other side of the wing, creating lift.

A boomerang has two airfoils, each facing in a different direction. This makes the aerodyamic forces acting on a thrown boomerang uneven. The section of the boomerang moving in the same direction as the direction of forward motion moves faster than the section moving in the opposite direction. Just like tank tracks moving at different speeds, this causes the boomerang to turn in the air and return to the thrower.

Most original boomerangs don't come back, and are not intended to do so! The returning variety are thought to have been made to scare birds into hunters nets. 


मराठी  :
 इतर कोणत्याही उडणाऱ्या  वस्तूप्रमाणे एरोडायनामिक्सच्या समान तत्त्वांवर बूमरॅंग्स कार्य करतात; बुमरॅंग कसे कार्य करते त्याची कळफळ म्हणजे एअरफईल.

एक एअरफोईल एका बाजूला सपाट असतो परंतु एका काठाने दुसऱ्या  बाजूला जाडसर वक्र असतो - हा बुमेरंग उचलायला हवा, तो हवेत ठेवून ठेवतो. लिफ्ट व्युत्पन्न केली गेली आहे कारण पंख च्या वक्र वर वाहणारी हवा सपाट बाजूने वाहणाऱ्या  हवेपेक्षा पुढे प्रवास करते. वक्र ओलांडत असलेली हवा पंखच्या दुसऱ्या   बाजूला पोहोचण्यासाठी लिफ्ट तयार करण्यासाठी वेगवान प्रवास करते.

बुमरॅंगमध्ये दोन एअरफोइल्स असतात, प्रत्येकजण वेगळ्या दिशेने तोंड करतो. हे फेकलेल्या बूमरॅंगवर कार्य करणारी वायुगतिक शक्ती असमान बनवते. फॉरवर्ड मोशनची दिशा उलट दिशेने जाणाऱ्या सेक्शनपेक्षा वेगाने फिरणार्‍या बुमेरॅंगचा विभाग. जसे वेगवान वेगाने टँकचे ट्रॅक फिरतात, यामुळे बुमरॅंग हवेमध्ये बदलतात आणि थ्रोवर परत येतात.

बर्‍याच मूळ बुमरॅंग परत येत नाहीत आणि असे करण्याचा हेतू नाही! परत येणारी वाण पक्ष्यांना शिकारीच्या जाळीमध्ये घाबरवण्यासाठी बनवलेले आहे असे मानले जाते.

Comments

Post a Comment

Popular posts from this blog

An Oddly Tilted Planet

By
The rotation period of Uranus’s atmosphere is about 16 hours. Like Jupiter and Saturn, Uranus rotates differentially, so this period depends on the latitude. This can be measured by tracking the motions of clouds. To determine the rotation period for the underlying body of the planet, scientists looked to Uranus’s magnetic field, which is presumably anchored in the planet’s interior, or at least in the deeper and denser layers of its atmosphere. Data from Voyager 2 indicate that Uranus’s internal period of rotation is 17.24 hours. Voyager 2 also confirmed that Uranus’s rotation axis is tilted in a unique and bizarre way. Herschel found the first evidence of this in 1787, when he discovered two moons orbiting Uranus in a plane that is almost perpendicular to the plane of the planet’s orbit around the Sun. Because the large moons of Jupiter and Saturn were known to orbit in the same plane as their planet’s equator and in the same direction as their...
Post a Comment
Read more

The Ptolemaic System

By
Explaining the nonuniform motions of the five planets was one of the main challenges facing the astronomers of antiquity. The Greeks developed many theories to account for retrograde motion and the loops that the planets trace out against the background stars. One of the most successful and enduring models was originated by Apollonius of Perga and by Hipparchus in the second century B.C. and expanded upon by Ptolemy, the last of the great Greek astronomers, during the second century A.D.  sketches the basic concept, usually called the Ptolemaic system. Each planet is assumed to move in a small circle called an epicycle, whose center in turn moves in a larger circle, called a deferent, which is centered approximately on the Earth. Both the epicycle and deferent rotate in the same direction As viewed from Earth, the epicycle moves eastward along the deferent. Most of the time the eastward motion of the planet on its epicycle adds to th...
Post a Comment
Read more

Special Theory Of Relativity

By
The theory of special relativity explains how space and time are linked for objects that are moving at a consistent speed in a straight line. One of its most famous aspects concerns objects moving at the speed of light.  Simply put, as an object approaches the speed of light, its mass becomes infinite and it is unable to go any faster than light travels. This cosmic speed limit has been a subject of much discussion in physics, and even in science fiction, as people think about how to travel across vast distances. The theory of special relativity was developed by Albert Einstein in 1905, and it forms part of the basis of modern physics. After finishing his work in special relativity, Einstein spent a decade pondering what would happen if one introduced acceleration. This formed the basis of his general relativity, published in 1915. Einstein's work led to some startling results, which today still seem counterintuitive at first glance even though his...
Post a Comment
Read more