if I'm doing an experiment about one dimension motion on an inclined track with a cart, and get different values of g ( values like: 8.79, 8.66, 8.77) , knowing g is 9.8 which means I have a percentage error of 10, 12 and 11). what are the sources of errors ( the only I can be sure of is maybe my angular indicator does not permit me to have precise values, so I took estimation, but what else can be the sources of error). the angle  estimate value is 3 degree  acceleration=gsin(theta)

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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.