Need a fun end of school year science activity that reinforces NGSS standard 5-PS2-1? Test the gravitational pull of the Earth with this Whirligig Drop STEM Challenge! Everything is included, just print, cut, and go! Use as a science activity to review steps in the scientific method and engineering design process, as a team building activity for back to school or anytime of the year.Students will explore how gravity and air pressure effect these whirligigs when they drop their models from differ