Identifies what does and does not change when matter experiences an external influence such as push, pull.
Gravity is a force that all living organisms have to deal with.
The body structure of animals is a system of balanced beams and masses. In order to stand or walk, animals like dinosaurs must balance on their feet. The center of gravity is the balance point of a body. When you balance a ruler on your finger, the center of gravity is right under your finger. Have each student find the center of gravity of a ruler.