Motion 2

 

1. When we say that something is in motion, we usually mean that it is moving. 
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3. But motion has a special meaning in science. 
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5. In science, motion is a change in position compared to a place or an object that is not moving. 
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7. The place or object that is not moving is called the frame of reference.
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9. We send a rocket to the moon.  
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11. Rocket or moon?  Which is the frame of reference?

Based on text here

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