Vectors and Superheroes

Vectors are everywhere...I'm preparing to do a physics unit on force and motion in my science methods class.  Did you know that Superman (as the story was originally written, before he gained his power of flight) actually obeyed the laws of physics?  His ability to "leap tall buildings in a single bound" is actually the result of the gravity differential between Krypton and Earth.  Gravity is the force "pulling" things toward the center of a planet; it is usually represented in a free body diagram with a vector pointing straight down.