“Dropping a coin from a skyscraper can kill someone.”

The idea that a small coin dropped from a great height, such as a skyscraper, could become a deadly projectile is a pervasive urban legend. This misconception likely stems from a natural intuition about gravity: if something falls for a long time, it must gather immense speed and force. While the thought of an object plummeting hundreds of feet can certainly sound alarming, the reality of physics, particularly involving our atmosphere, paints a very different picture for lightweight objects.

In truth, a falling penny reaches what scientists call terminal velocity relatively quickly due to the opposing force of air resistance. Unlike in a vacuum where an object would accelerate indefinitely, the air pushes back on the penny, eventually balancing the pull of gravity. For a penny, this equilibrium is achieved at a speed far less than what would be necessary to cause serious harm. Its small mass and flat shape are key factors, increasing the surface area relative to its weight, thereby maximizing air resistance and limiting its potential speed.

People commonly believe this myth because they often overlook the critical role of air resistance in everyday physics. Without considering this force, it's easy to imagine an object continually speeding up until impact, leading to a catastrophic result. While a penny dropped from a skyscraper would indeed hit the ground with some force, it would be comparable to being flicked with a finger, perhaps causing a minor sting, a small bruise, or at most, a superficial scratch. It simply does not possess the kinetic energy to be lethal, busting this dramatic claim.