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## Long-Term Learning

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### dimension

The manifoldness with which the fundamental units of time, length, and mass are involved in determining the units of other physical quantities.

### instantaneous acceleration

the limit of the average acceleration as the time interval (dt) approaches zero

### acceleration due to gravity

denoted by g; the magnitude of free-fall acceleration, which increases as altitude decreases

### frame of reference

a choice of coordinate axes that defines the starting point for measuring any quantity

### parabola

a plane curve formed by the intersection of a right circular cone and a plane parallel to an element of the curve