In classical mechanics, a central force on an object is a force that is directed towards or away from a point called center of force. F → → = F ( r ) = | F ( r ) | r ^ ^ where F → → is the force, F is a vector valued force function, F is a scalar valued force function, r is the position vector, || r || is its length, and r ^ ^ = r / ‖ ‖ r ‖ ‖ is the corresponding unit vector.