What does an entity relationship diagram represent? Why do accountants need to understand them?

Which document triggers the revenue cycle?

In the relational database model

A push or a pull

Static Friction

Energy stored in a stretched rubber band

The rate at which position changes

Motion where the only force acting on the object is gravity   Tom Petty loves this motion.

Used to find the direction of torque

When a book rests on a table the two forces present are weight downward and the normal force upward.  Where does the normal force come from?