The earth rotates around the sun with a constant speed

The earth rotates around the sun with a constant speed -...

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The earth rotates around the sun with a constant speed. Is the earth an inertial reference frame? At first glance, the earth seems to be an inertial reference frame, as it retains constant speed. However, it does not retain constant velocity. Recall that velocity is a vector while speed is a scalar. Though the magnitude of the velocity remains constant, the direction changes. In fact,
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Unformatted text preview: when we calculate the change in velocity through vector addition we see that Δv points in the exact direction of the gravitational force exerted on the earth by the sun, as expected by Newton's Second Law: Since the earth has a constantly changing velocity, it experiences constant acceleration, and is not an inertial reference frame....
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