anything that takes up space
A kid friendly definition of the word energy is, the ability to do work.
Your neck
a kid friendly definition would be two or more people that disagree on something and are not getting along.
not exact but the mass of an atom
changing
competition
A kid friendly definition would be - The head of the Catholic Church.
the definition is a sun the is colder than usual and has low mass
A kid friendly definition of disease would be "a very serious sickness a person/people could catch or already have from their parents.
Because that is the definition of mass.
Mass is the amount of matter in an object.
He was a really kewl kid.