Air friction increases the velocity of the sastellite. Explain.

Explanation

To explain how air friction increases the velocity of a satellite, we can break down the problem step by step:

### Step 1: Understanding the Satellite's Motion
A satellite is in orbit around the Earth, moving in a circular path with a certain radius (r) and speed (v). The gravitational force between the Earth and the satellite provides the necessary centripetal force to keep the satellite in orbit.

### Step 2: Centripetal Force and Gravitational Force
The centripetal force required to keep the satellite in circular motion is given by the formula:
\[ F_c = \frac{mv^2}{r} \]
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