This project uses the density of the gas the object is in, the mass of the object, the frontal surface area of the object, and the wind speed and direction to calculate the terminal velocity of the object. There is also a simulate button, which allows you to see what would happen under the given conditions if this object were to fall from a set height. The pen allows you to see the exact trajectory of the object. Sometimes if the wind is set too high the object will skip a bit, so lower settings are recommended. Explosions upon hitting the ground, just for fun, are coming soon!