How can subsidence lead to the formation of sedimentary rock

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Which two particles are found in the center of an atom

1. explain how you calculate the net force in any direction on the box. 2. suppose an upward force of 15n is added to the box. what will be the net vertical force on the box? 3. what force could be applied to the box to make the net force in the horizontal direction zero? explain. 4. suppose a force of 25n to the right is added to the box. what will be the net force to the right?