Chapter 3 Flashcards
(8 cards)
Define a field
A region of space in which each point is subject to a non-contact force.
Define a planet’s altitude
The height of an object above the surface of a planet.
Note: The distance from the planet’s center is used when finding its gravitational field strength. Radius + Altitude
Define a monopole
A field in which all field lines point in one direction, so either towards or away from the central object/planet generating the field.
Define a dipole
A field in which field lines point both towards and away from the center of the field simultaneously.
Define a uniform field
A field that is constant in magnitude and direction at all points in space. This means the magnitude of the force experienced is the same at all points, requiring a constant field strength.
Define a non-uniform field
A field that varies in magnitude concerning the location of an object within the field. So, if the field strength decreases with distance, the force will decrease as well.
Define the term “orbit.”
A periodic path followed by one object (satellite) around another mass due to the gravitational force it experiences. This periodic path is modeled as uniform circular motion and the force due to gravity is equal to the centripetal force on the satellite.
Define the term “Geostationary orbit,” and list the conditions for this to be achieved.
This occurs when a satellite remains above the same position of Earth at all points during its orbital period.
: The satellite’s orbital period is the same as the Earth’s, being 24 hours.
: The satellite must rotate in the same direction as the Earth’s rotation.
: The orbiting satellite must be orbiting directly above the Earth’s equator. (As the force due to gravity on the satellite acts to Earth’s center, and if it is not directly located above the equator, the gravitational force would cause the satellite to drift away from its intended position).
