Newton's First Law of Motion:
Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.
Newton's Second Law of Motion:
The relationship between an object's mass m, it's acceleration a, and the applied force F is F = ma.
Newton's Third Law of Motion:
For every action there is an equal and opposite reaction.
Most of us were "taught" these laws in school, at some point, probably as teenagers, but the understanding of them started in preschool, even before, the academic teaching being a mere re-labeling, a re-wording, a re-contextualization, of something that already lives within us as experiences like rolling tires down a hill.
This is why the human animal must play, not just so that the formulas will make sense when we're older, but so the world will make sense. The children have no idea they are learning physics any more than they know they are learning to be self-motivated learners, practicing being sociable, and acquiring the skills and habits necessary to work well with others. That's because all of the foundational learning that results from children playing together amongst "beautiful" things is nothing but a byproduct of their play.
Play is a pure good and the moment we as adults forget that is the moment we taint it with our good intentions, rendering it something else, something lesser. That's why we're at our best as educators when we can be like the children and allow ourselves to be content with their games. It's the rolling of tires up and down hills in the company of others that matters. Our job is to provide the hill and the tires. The rest is a happy accident.