1.) A crate weighing 100N sits at rest on a horizontal surface. What is the magnitude of the normal force on the crate ? 0N.50N,100N, or 150N.
1.2)a 50N downward force is applied to the crate. what is the magnitude of the normal force on the crate?
1.3)a 20N upward force is applied to the crate. what is the magnitude of the normal force on the crate?

2.) A crate weighing 100N is pressed upward against a ceiling by a 130N force. What is the normal force the ceiling applies to the crate? 30N, 100N, 130N, 160N, or 0N.