Why earth rotate in circular motion
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due to centripetal force. of sun and earth
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It isn’t. The Earth describes an eliptical path around the Sun. When it is nearest, at perihelion, the Earth’s speed is greatest. When the Earth is it at the part of its orbit where it is farthest away, at aphelion, it is moving slowest.
However, the Earth travels an elipse which is only about 4% longer than it is wide. So, it describes approximately a circle around the Sun. It’s speed at aphelion is only slightly slower (4% in fact) than at perihelion. All this is the result of the conservation of angular momemtum.
So, the speed of the Earth around the Sun is nearly constant and it moves around in nearly circular orbit. In short, it orbits the Sun with approximately uniform circular motion.
Notice that this notion of approximately uniform circular motion lies between the conceptual extremes of uniform curcular motion and not uniform circular motion.
However, the Earth travels an elipse which is only about 4% longer than it is wide. So, it describes approximately a circle around the Sun. It’s speed at aphelion is only slightly slower (4% in fact) than at perihelion. All this is the result of the conservation of angular momemtum.
So, the speed of the Earth around the Sun is nearly constant and it moves around in nearly circular orbit. In short, it orbits the Sun with approximately uniform circular motion.
Notice that this notion of approximately uniform circular motion lies between the conceptual extremes of uniform curcular motion and not uniform circular motion.
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