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5 terms

Motion, Forces and Energy: Chapter 1, Sec 1

Describing and Measuring Motion.
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Motion
The state in which one object's distance from another is changing.
Reference Point
A place or object used for comparison to determine if an object is in motion.
International system of Units
A system of measurement based on multiples of ten and on established measures of mass, length, and time.
Meter
The basic SI unit of length.
Speed
The distance an object travel per unit of time.