What Happens If You Drop a Penny From the Empire State Building?

TL;DR

Dropping a penny from the Empire State won't kill.

Transcript

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Key Insights

• The myth suggests a penny dropped from the Empire State Building could kill someone by turning into a bullet due to high speed.
• Air resistance limits the speed of falling objects, preventing them from accelerating indefinitely, reaching a terminal velocity.
• A penny reaches its terminal velocity after falling just 15 meters, much less than the height of the Empire State Building.
• At terminal velocity, a penny falls at around 40 km/h, insufficient to cause fatal injuries.
• Pennies are flat and light, making them un-aerodynamic and prone to erratic movement, further slowing their descent.
• Wind and updrafts caused by the building can prevent a penny from even reaching the ground.
• In a vacuum, a penny could reach speeds of 320 km/h, but even this is unlikely to be lethal.
• More aerodynamic objects, like a pen, could potentially cause more damage if thrown from the building.

Questions & Answers

Q: Can a penny dropped from the Empire State Building kill someone?

No, a penny dropped from the Empire State Building cannot kill someone. Due to air resistance, a penny reaches a terminal velocity of about 40 km/h, which is not fast enough to cause fatal injuries. The penny's flat, light design also makes it un-aerodynamic, further reducing its speed.

Q: What is terminal velocity and how does it affect falling objects?

Terminal velocity is the constant speed that a falling object reaches when the force of gravity is balanced by air resistance. For a penny, terminal velocity is reached after falling just 15 meters. This means it will not accelerate further, and its speed will remain constant, preventing it from being lethal.

Q: Why does air resistance prevent a penny from being lethal when dropped from a height?

Air resistance acts against the force of gravity, slowing down the acceleration of falling objects. A penny, being flat and light, encounters significant air resistance, causing it to reach a low terminal velocity of 40 km/h, insufficient to cause fatal injuries, even from a great height.

Q: What factors could potentially make a falling object more dangerous?

A more aerodynamic object, like a pen, could potentially be more dangerous if dropped from a height. Aerodynamic objects encounter less air resistance, allowing them to maintain higher speeds. Additionally, objects with narrow, pointed ends could cause more damage upon impact.

Q: How does the design of a penny affect its fall?

The design of a penny, being flat and light, makes it un-aerodynamic. This causes it to spin and move erratically as it falls, increasing air resistance and reducing its speed. As a result, it reaches a low terminal velocity and is unlikely to cause significant harm.

Q: Could a penny be lethal in a vacuum?

In a vacuum, a penny could reach speeds of around 320 km/h, as there would be no air resistance to slow it down. However, even at this speed, it is unlikely to be lethal, as it would still not have enough mass or momentum to cause fatal injuries.

Q: How do wind and updrafts affect the fall of a penny from the Empire State Building?

Wind and updrafts can significantly affect the fall of a penny from the Empire State Building. The building itself creates updrafts that can blow light objects back upward, often causing them to land on ledges rather than reaching the ground, further reducing the chance of any harm.

Q: What are some alternative objects that could be more harmful if dropped from a height?

Alternative objects, such as a ballpoint pen, could be more harmful if dropped from a height. A pen is more aerodynamic and can maintain higher speeds, potentially reaching up to 320 km/h under perfect conditions. Its narrow, metal tip could cause more damage upon impact.

Summary & Key Takeaways

• The myth that a penny dropped from the Empire State Building could kill someone is debunked. Due to air resistance, a penny cannot accelerate indefinitely and reaches a terminal velocity of 40 km/h, which is not fast enough to cause fatal injuries.

• The flat, light design of a penny makes it un-aerodynamic, causing it to spin and move erratically, further reducing its speed. Additionally, wind and updrafts from the building can prevent the penny from reaching the ground.

• In an airless vacuum, a penny could reach higher speeds, but even then, it is unlikely to be lethal. More aerodynamic objects, like a pen, could potentially cause more damage if dropped from the building.