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Hang a pen by a piece of string. 1.Is the pen at rest or in motion, Hang a pen by a piece of string. 1.Is the pen at rest or in motion, explain. 2.are there forces acting of the pen?explain. cut the string with a pair of scissors 3.what happens to the pen?what could have caused the pen's motion?explain. place a book on the top of a table 4.is the book at rest, or in motion?explain. 5.are there forces acting on the book?explain.