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What is the difference between relative and absolute acceleration?

ANSWER: The Display > Show Plot Functions menu presents options for either relative or absolute acceleration. Relative acceleration is within the reference frame local to the structure. Absolute acceleration is within a universal reference frame, and is given as the sum of relative acceleration and ground acceleration. The same relative and absolute designations also apply to velocity and displacement.

The Display > Show Plot Functions menu presents options for either relative or absolute acceleration. 

Is acceleration load only applied to selected members?

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