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.