Things can change in different ways, such as in size, weight, color,
and movement. Some small changes can be detected by taking measurements.
NSES Content Standard B
Physical Science: Position and motion of objects Grades K-4, page 127 An object's motion can be described by tracing and measuring its position over time. See also the general discussion in Unifying Concepts and Processes:
Constancy, change, and measurement.
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