1. Forward motion (tangential velocity): This is the speed at which the object is moving in a straight line, tangent to the orbit's path. This motion tries to keep the object moving away from the center of the orbit.

2. Gravitational attraction: This is the force of gravity pulling the object towards the center of the orbit. This force tries to pull the object directly towards the center.

The balance between these two forces is what creates an orbit.

* If the forward motion is too slow, the object will fall towards the center of the orbit.

* If the forward motion is too fast, the object will fly off into space.

It's like a constant tug-of-war, and the object's path becomes a curve, an orbit, due to the balance between these two forces.