Fighting words

A full bottle will strike a target with almost 70% more energy than an empty bottle. In other words, it takes less muscle work to achieve a greater striking energy when fighting with a full bottle, even though lifting the bottle requires slightly more energy.quote from text of Are full or empty beer bottles sturdier and does their fracture-threshold suffice to break the human skull?, a peer-reviewed research paper in the Journal of Forensic and Legal Medicine, 2009.