BY LETTER
Acceleration
The rate of change of velocity. An object moving at a constant velocity in a coordinate system (reference frame) has zero acceleration. An object whose velocity is increasing has a positive acceleration; an object whose velocity is decreasing has a negative acceleration. Acceleration relative to a freely falling reference frame is experienced as gravity.
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Development Notes
Text by M. Alan Kazlev
Initially published on 31 December 2001.
Initially published on 31 December 2001.
