What is the acceleration  of  the Earth to stay in its nearly circular orbit around the Sun?  Assume the radius of the orbit is 150,000,000 km, and the time to complete an orbit is 365 days.   Pick those answers that apply.     About 6 m/s2 away from the Sun (compare to "g" near Earth which is 9.8 m/s2)     Exactly the acceleration needed to maintain a closed curved and elliptical orbit year after year.     The Earth is not accelerating, it is moving at a constant velocity.     Much smaller than "g" and away from the Sun.     About 6 m/s2 toward the Sun (compare to "g" which is 9.8 m/s2)

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Central Force

Central force is the force that acts along the center of mass of one body to the center of mass of another body. Its direction from or away from a point on a body to another is called the center of the force. Such forces include gravitational force between two massive objects or electrostatic forces between two charged particles. So from atoms to planets, the central forces play an important role in shaping our daily lives. One of the remarkable features of central forces is that they are conservative, i.e. the total energy of a central force system can always be expressed as a gradient of a potential energy function.