“Dropping a penny from a skyscraper can kill someone on the ground.”

The idea that a penny dropped from a skyscraper could become a deadly projectile is a pervasive urban legend, often fueled by dramatic depictions in popular culture, such as a memorable cartoon where a falling coin incinerates a character. This misconception likely stems from the awe-inspiring height of structures like the Empire State Building, leading many to assume that gravity would grant an object an ever-increasing, catastrophic speed. The psychological impact of standing atop such a tall building might also contribute to an exaggerated sense of the power of a dropped item.

However, the scientific truth reveals a different outcome. As a penny falls, it encounters air resistance, a force that opposes its downward motion. This resistance quickly balances the force of gravity, causing the penny to reach what physicists call terminal velocity. For a penny, this maximum speed is surprisingly slow, typically between 25 and 50 miles per hour. Its light weight, around 2.5 grams, and flat shape mean it flutters like a leaf rather than plummeting like a bullet. At this speed, a penny would deliver a mild sting or flick upon impact, far from a fatal blow. Experiments have shown it cannot even penetrate ballistic gel or a dummy skull.

The myth persists because our intuition often struggles with concepts like air resistance, leading us to believe that an object falling for a long distance will simply keep accelerating. While it's true that falling objects can be dangerous, especially heavier or more aerodynamic ones, the penny's physical characteristics prevent it from becoming a lethal weapon. The real danger lies with larger, denser items, not a humble coin.