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http://www.youtube.com/watch?v=CgqBg44azYk
So at 38:50 is my question.
If we move a object from infinity to a point P, how come the force applied in moving that object to point P is not in the same direction( it is opposite). the gravitational force would be the opposite direction of the applied force which is in the direction of point P.
Also, how come it is negative gravitational PE when you move from infinity which at our ref will be 0 to point P.
So at 38:50 is my question.
If we move a object from infinity to a point P, how come the force applied in moving that object to point P is not in the same direction( it is opposite). the gravitational force would be the opposite direction of the applied force which is in the direction of point P.
Also, how come it is negative gravitational PE when you move from infinity which at our ref will be 0 to point P.