Halley's Comet orbits the sun on an 80 year cycle. The comet is 88 X 106 km from the sun at perihelion. Calculate the force of gravity on the Halley's Comet. The mass of Halley's Comet is 2.2 X 1014 kg and the mass of the sun is 2.0 X 1030 kg. (ans: 3.8 X 1012 N) Show work.

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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.