Loose, attached parts tend to start moving with a delay and lag behind because of inertia.

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 follow through motion after the main action came to a stop.