Frames of reference (video) | Khan Academy
https://www.khanacademy.org/science/ms-physics/x1baed5db7c1bb50b:movement-and-forces/x1baed5db7c1bb50b:representing-motion/v/frames-of-reference
WEBThe position and motion of an object is always measured with regard to a frame of reference. For example, a car's speed looks different if you're still, moving, or in space. To avoid mix-ups, it's important to state the frame of reference. This concept helps us understand and communicate about motion accurately.
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