anonymous user


Why does earth spin

Asked on near Salt Lake City, UT
Topics: SciencePhysicsQuantum Mechanics, Earth, Planets, Astronomy


Jeff W-

The Earth spins because it formed in the accretion disk of a cloud of hydrogen that collapsed down from mutual gravity and needed to conserve its angular momentum. It continues to spin because of inertia.

Cara Mia

The angular momentum of an object is defined relative to a fixed point. In the case of astronomy the Sun is used as the fixed point. The amount of angular momentum of an object with respect to a fixed point is proportional to the object’s moment of inertia and to the angular velocity relative to the fixed point. Multiplying those three factors gives the angular momentum. Angular velocity is defined by the right hand rule.(here is a link to a simple explanation of the right hand rule) The direction of angular momentum is the same as that of the angular velocity.

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Why does earth spin

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