Scene animation in SketchUp typically involves changing the Camera Location from Scene > Scene to create a walk-through or fly-through.
In such animation the objects in the model are stationary; only the Camera moves.
The camera is in fact the only thing that can move as SketchUp has no native ability to animate objects.
You can create the illusion of an object moving by creating multiple copies of the object positioned incrementally along the intended path.
In many ways the method is akin to Flip Book animation.
Each instance of the object is assigned to a unique Layer.
The visibility of each Layer is controlled by the Saved Properties of each Scene you create.
Camera Location remains static from Scene > Scene.
Take a look at the animation models below.
Open the Entity Info, Layers and Scenes mangers to see the relationship of Scene, Layer and Entity as you click through the Scene tabs.