The first law of thermodynamics states that energy is neither created or destroyed, merely converted from one form into another.
The apple presumably started that day like any other. The dawn light refracting over the garden wall to be both absorbed and reflected by its skin, that latter portion rendering whichever lucky observer saw it to smile upon its redness. Later, perhaps some bobbing on a branch. Maybe a perching place for a small songbird. You know, apple stuff.
Given what else we know of that apple’s day, we can hypothesise of the apple that its volume was large, its density ripe and the forces resultant from those two properties that were acting through the small umbilical of wood that connected the apple to the branch were reaching some critical point.
The first law of thermodynamics states that energy is neither created or destroyed, merely converted from one form into another.
Potential energy. A coiled spring. A glass on the edge of a table next to a cat. A ripe apple being blown by a pleasant summer breeze directly above the balding scalp of a man named Isaac.
Kinetic energy. Motion. Falling.
Sound energy. Thunk.
Heat energy that instantaneously dissipates into the air as the impact is absorbed by both the man’s skull and the body of the apple itself, the percussive shockwaves later ripening into bruises on both parties.
A lightbulb moment.
Newton’s Law of Universal Gravitation states that every particle attracts every other particle in the universe with a force that is proportional to the product of their masses, and inversely proportional to the square root of the distance between their centres.
In other words, the closer things are together, the stronger the attractive force between them.
Do you think that explains what happened to us?