Fields

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Gravitational Field
A feld created around any object with mass extending to infinity but diminishing with distance.
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Gravitational Field strength
Force (gravitational) per unit mass at a point in a g field
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Gravitational field lines
Lines of force used to map field pattern around object
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Radial Field
Symmetrical field that diminishes with distacne^2 form centre
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Uniform Gravitational Field
Field lines are parallel and value for g is constant
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Newton's Law of Gravitation
The force between 2 point masses is dircelty proportional to the product of the masses and inversely proportional to the square to the distance between them.
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Kepler's 1st law
The orbit of a planet is an ellipse with the sun at one of the two foci.
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Aphelion
The furthest point from the sun in an orbit
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Perihelion
The closet point to the sun in an orbt
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Kepler's 2nd Law
A line segement connecting a planet to the sun sweeps out equal areas during equal time intervels.
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Kepler's 3rd Law
The square of the orbital period is directly proportional to the cibe of its orbital radius.
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Astronomical Unit
The mean distance from the earth to the sun (1.5 x 10^11)
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Geostationary Satellites
A satellite that travels above equator at same point in direction of earth's rotation with a period of 24hrs.
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Gravitational potential
The work done per unit mass to bring an object from infinity to a point in a g field.
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Escape velocity
The minimum velocity at which an object has just enough energy to leave a g field.
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Electric field strength
The force experienced per unit positive charge
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Coulomb's Law
Any two point charges exert an electrostatic force on each other directly proportional to the product of their charges and inversely proportional to the square of their separation.
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Electric Pontential
The work done per unnit positive charge to bring a charge from infinity to a point in an e field.
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Other cards in this set

Card 2

Front

Force (gravitational) per unit mass at a point in a g field

Back

Gravitational Field strength

Card 3

Front

Lines of force used to map field pattern around object

Back

Preview of the back of card 3

Card 4

Front

Symmetrical field that diminishes with distacne^2 form centre

Back

Preview of the back of card 4

Card 5

Front

Field lines are parallel and value for g is constant

Back

Preview of the back of card 5
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