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mLine 15:
Line 15: − +
Missed a minus sign
Kepler's third law of planetary motion states that the square of the time period of a planet is proportional to the cube of the orbital distance. This can be seen as the [[earth]] undergoes circular motion around the [[sun]]. The force, <math>F</math>, acting on the earth is just [[gravity]] so
Kepler's third law of planetary motion states that the square of the time period of a planet is proportional to the cube of the orbital distance. This can be seen as the [[earth]] undergoes circular motion around the [[sun]]. The force, <math>F</math>, acting on the earth is just [[gravity]] so
<math>F = \frac{GMm}{r^2}</math>
<math>F = - \frac{GMm}{r^2}</math>
Where
Where