According to Newton, every force has an equal and opposite force. If I am going forward with the force of 10 newtons, there is a force of 10 newtons pushing me back. Wouldn't the forces cancel each other out? What's the deal with stuff moving?
Your statement is correct for an (to us) immovable object, such as a wall or a large boulder. If we push an object and it moves with an ever increasing velocity, the force applied by the object is negative and the same magnitude. To me the third law is is sketchy in the case of immovable objects. We have to create a virtual force mathematically. The wall can't actually push back. It is the same case for orbital motion. Centripetal force that which points toward the center of the motion. We had to create a virtual centrifugal force to keep an object from flying away. These are, of course, simplifications.
That's not so true Papa ...as you must Shirley know by now,I'm and irremovably object somewhat like an inaccessible thorn in your side that can't ever be reached from across the pond....unless you're like the long are of the Law.... :)
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Kittigate 