Loose, attached parts tend to start moving with a delay and lag behind because of Inertia is the resistance of any physical object to any changes like starting or stopping a motion or changing direction... More.
This is clearly visible at the tip of dangling cloth or tails. They seem to briefly stay in place after the element they are attached to already started moving and they are being dragged behind pointing towards the direction they came from.
Drag is also an important part of body mechanics. Depending on the motion, body parts can be dragged behind by a rapid main action.
Elements that were dragged behind tend to overshoot into a Loose, attached parts tend to continue moving after the leading element came to a stop. When a leading element is slowin... More motion after the main action came to a stop.