Thursday Morning Riddle

I’m relaxing at home; I’m a musical pause;
When a lawyer is finished defending his cause;
The Professor and Mary Ann’s common applause;
And I’m featured, with motion, in Newton’s three laws.

Who am I?

UPDATE: Riddle solved by Brian. See comments for answer.

2 Responses to “Thursday Morning Riddle”

  1. Brian Says:

    A rest!

  2. Bill Says:

    REST is correct. Way to go, Brian!

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