Primary School (K-2)
A bigger push or pull makes things speed up or slow down more quickly.
Elementary School (3-5)
When objects collide, the contact forces transfer energy so as to change the objects’ motions.
Middle School (6-8)
When two objects interact, each one exerts a force on the other that can cause energy to be transferred to or from the object.
High School (9-12)
When two objects interacting through a field change relative position, the energy stored in the field is changed.