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When we talk about terminal velocity, we're talking about a free falling object. The free
falling object is pulled by gravity towards the center of the Earth. Now this object is
opposed by friction in air. And that force is called air drag. Let me illustrate. Here's
this object. And it's falling with a force Fg. Force by gravity. Now the drag force is
exactly opposite. Fd. Now when Fg equals Fd. Then you're in equilibrium. And you have reached
a velocity that is constant. And it is called the Terminal Velocity.