Air track

The Air Track may also refer to a breakdance move.

See also AirTrack (disambiguation) for other uses.

An air track at Sir Winston Churchill High School, Calgary,Alberta, Canada

An air track is a scientific device used to study motion in low friction environment. Its name comes from its structure: air is pumped through a hollow track with fine holes all along the track that allows specially fitted air track cars to glide relatively friction-free. Air tracks are usually triangular in cross-section. Carts which have a triangular base and fit neatly on to the top of the track are used to study motion in low friction environments.

The air track is also used to study collisions, both elastic and inelastic. Since there is very little energy lost through friction it is easy to demonstrate how momentum is conserved before and after a collision. The track can be used to calculate the force of gravity when placed at an angle. ^[1]

It was invented in the mid-1960s at the California Institute of Technology by Prof Nehr and Leighton. It was first presented by them at a meeting of the American Physical Society in NYC in 1965(?) where it was viewed by Prof John Stull, Alfred University, and Frank Ferguson, the Ealing Corporation. The original track was about 1 meter long with tiny air orifices and highly compressed air. Stull returned to Alfred Univ. Where he developed a simple version using standard square aluminum tubing with large air orifices and air from the vent of a shop vacuum cleaner. Stull with Ferguson's help at Ealing designed a custom aluminum track that Ealing offered commercially in various lengths up to 10 meters. T. Walley Williams III at Ealing extended the concept to the 2-dimensional air table in 1969.

^[2]^[3]

References

↑ 2.0 m Air Track, Pasco. http://store.pasco.com/pascostore/showdetl.cfm?&DID=9&PartNumber=SF-9214&Detail=1 Accessed 06 September 2007.
↑ http://www.freepatentsonline.com/3299535.html
↑ http://physci.alfred.edu/faculty.html

External links

Theories of gravitation

Standard

Newtonian gravity (NG)	Newton's law of universal gravitation History of gravitational theory
General relativity (GR)	Introduction History Mathematics Resources Tests Post-Newtonian formalism Linearized gravity ADM formalism Gibbons–Hawking–York boundary term

Alternatives to
general relativity

Paradigms	Classical theories of gravitation Quantum gravity Theory of everything
Classical	Einstein–Cartan Bimetric theories Gauge theory gravity Teleparallelism Composite gravity f(R) gravity Massive gravity Modified Newtonian dynamics (MOND) Nonsymmetric gravitation Scalar–tensor theories Brans–Dicke Scalar–tensor–vector Conformal gravity Scalar theories Nordström Whitehead Geometrodynamics Induced gravity Tensor–vector–scalar Chameleon Pressuron
Quantisation	Euclidean quantum gravity Canonical quantum gravity Wheeler–DeWitt equation Loop quantum gravity Spin foam Causal dynamical triangulation Causal sets DGP model Rainbow gravity theory
Unification	Kaluza–Klein theory Dilaton Supergravity
Unification and quantisation	Noncommutative geometry Semiclassical gravity Superfluid vacuum theory Logarithmic BEC vacuum String theory M-theory F-theory Heterotic string theory Type I string theory Type 0 string theory Bosonic string theory Type II string theory Little string theory Twistor theory Twistor string theory
Generalisations / Extensions of GR	Scale relativity Liouville gravity Lovelock theory (2+1)-dimensional topological gravity Gauss–Bonnet gravity Jackiw–Teitelboim gravity

Pre-Newtonian theories and toy models

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