“A penny dropped from a skyscraper can kill someone.”

It's a common dramatic image: a small coin plummeting from the dizzying height of a skyscraper, gathering lethal momentum. This popular notion, often fueled by cinematic exaggeration and a general awe of great heights, suggests that a penny could become a deadly projectile, capable of fracturing a skull or even piercing skin upon impact. The myth likely stems from a natural human intuition that anything falling from a tremendous distance must hit with tremendous force, overlooking the crucial role of physics in the real world.

The truth, however, is far less dramatic and rooted in the principles of aerodynamics. As an object falls, it accelerates due to gravity, but simultaneously encounters air resistance. For small, light objects like a penny, this resistance quickly becomes significant. Eventually, the upward force of air resistance balances the downward force of gravity, causing the object to stop accelerating and instead fall at a constant speed known as its terminal velocity. For a penny, this terminal velocity is surprisingly slow, estimated to be around 25-50 miles per hour, depending on its orientation and other factors.

People commonly believe this myth because it intuitively feels correct that an object falling for a long time would just keep getting faster and faster, accumulating destructive power. Our everyday experiences with gravity often don't involve distances great enough for air resistance to become the dominant factor, leading to a misconception about the true potential of falling objects from extreme heights. The sheer scale of a skyscraper can make the idea of a tiny, harmless object gaining deadly force seem plausible.

While being struck by a penny traveling at terminal velocity would certainly sting and might leave a minor bruise or welt, it lacks the kinetic energy to cause serious injury. It would feel more like a flick from a finger or a hard raindrop than a bullet. The penny simply cannot achieve the speeds necessary to break bones, penetrate skin, or cause any truly lethal damage, making this enduring skyscraper tale unequivocally busted.