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16 Cards in this Set
- Front
- Back
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Gravitational field
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A region in which a gravitational force is experience by an object with mass
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Gravitational field strength
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the force experienced by unit mass
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Freefall
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move under the force of gravity only
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Field line
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the direction in which an object is accelerated
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Types of field shape
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Radial and uniform
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Newton's law of gravitation
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The attraction between two masses is proportional to the product of their masses and inversely proportional to the square of the distance between them
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Gravitational potential
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the gravitational potential energy that a unit mass would have at a particular field
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Potential difference
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Energy needed to move a unit mass from one potential to another
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Equipotential
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The area around a mass where the gravitational potential is constant
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Relationship between gravitational force and distance
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Inverse square relationship
As distance increases by a factor of k, force decreases by a factor of 1/k |
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Area under the curve of g against r
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gravitational potential
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gradient of the tangent of the curve of V against R
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g
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Time period for a satellite
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√4π²r³/GM
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Speed of a satellite
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√GM/r
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Energy of an orbiting satellite
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Total energy is constant
shared between PE and KE |
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Geosynchronous satellites
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Time period is 24 hours
Orbit over the equator Always over the same point Travels at the same angular speed as Earth Stationary relative to point on Earth Used for TV/Telephone signals |
