Planetary Motion: Keplers Law of Periods

This lesson will focus on Kepler's Law of periods and how a planet period squared is proportional to the semi major access cubed. A semi major access will be drawn and explained, in relation to a... This lesson will focus on Kepler's Law of periods and how a planet period squared is proportional to the semi major access cubed. A semi major access will be drawn and explained, in relation to a circle and its radius. This lesson will look at circular motion and look at net force to derive an expression to relate the period and the radius of the circular orbit.
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