The total kinetic resistance of a moving part (a firearm bolt) was acquired by experiment because water resistance was difficult to be got accurately.

So the bugs go with the flow and offer little resistance. And the drop slows only slightly, keeping its kinetic energy rather than blasting the bug.

By using MR technology, MR damper, which has many notable advantages such as continuously controllable resistance and strong ability to consume kinetic energy, is widely used in many fields.