Speed of light is the fastest motion that can be measured in any frame of reference.
- A frame of reference is a reference point combined with a set of directions.
- A frame of reference is similar to the idea of a reference point. A frame of reference is defined as a reference point combined with a set of directions.
- Something is in motion if it is changing position. It could be a fast-moving airplane, a leaf swirling in the wind, or water trickling from a hose.
- 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.
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