# Gravity and Inverse Square Relationships NISPage 3

Slide 20

## Information on Geostationary Satellites

For a satellite to be in a particular orbit, a particular velocity is required or a given height above Earth ‘r0+h’.

Telecommunications satellites remain above one given point on the Earth’s surface, so are called geostationary.

Spy Satellites move in a polar orbit so that they can perform sweeps of the surface.

Slide 21

Formulae for calculating satellite orbits

ω = 2πf;

v = ωr;

a = ω2r

a=v2/r → v2=ar

v=2πr/T

g=GM/r2

V=-GM/r

Slide 22

References:

Giancoli , Physics: Principles with Applications, 6th edition

http://kilby.sac.on.ca/physics/sph4u/3-Fields/GravEnergy.htm

http://www.antonine-education.co.uk/Pages/Physics_4/Fields/FLD_02/Fields_page_2.htm

http://www.physicsclassroom.com/class/circles/u6l3c.cfm

http://hyperphysics.phy-astr.gsu.edu/hbase/gpot.html

http://blog.superprincipia.com/2012/01/16/a-theory-of-gravity-for-the-21st-century-the-gravitational-force-and-potential-energy-in-consideration-with-special-relativity-general-relativity/

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