Frame of reference - Simple English Wikipedia

# Frame of reference

### From Wikipedia, a free encyclopedia written in simple English for easy reading.

A frame of reference is how one tells an object is moving. For example, when you see a ball roll down a street, you can tell the ball is moving because the frame of reference is the streets, whatever may be on the side of the roads or the Earth. All of these are a frame of reference.

The most common frame of reference is Earth itself, even though it moves.

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Categories: Physics | Geometry

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