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OldTimeyMedicine t1_j1ezp6r wrote

Reply to comment by hearnia_2k in Speedometer of a newer Mustang reads "Ground Speed" by egordoniv

Setting aside speedos for a moment, the Car Speed would be relative to the frame of reference, or more appropriately, the rate at which the wheels are turning since the speedometer is measuring that based on the wheel rotation. So if the car is drifting, the speedometer will present the speed according to wheel speed rather than the resolved components of the speed vectors, where the datum isn't defined here.

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hearnia_2k t1_j1ffmaf wrote

Yes, it's true, and I even mentioned this in another comment, but it's also not what you previously states, where you said it's the speed the car is actually moving; but it's not, it's based on having a value for the outer circumference of the tyre, and speed of rotation etc.

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