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StrandStrand 1Strand 2Strand 3Strand 4
Instructions: Click on the molecules for grade-by-grade information.
K-4 The position and motion of objects can be changed by pushing or pulling. The size of the change is related to the strength of the push or pull. An object's motion can be described by tracing and measuring its position over time. The position of an object can be described by locating it relative to another object or the background.   

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