what is it that enables you to stay on the ground?
The force that enables objects, including humans, to stay on the ground is gravity. Gravity is a fundamental force of nature that exists between any two objects with mass. The Earth has a considerable mass, which creates a gravitational pull towards its center. This force pulls everything towards the ground, giving us the sensation of being firmly planted or "staying on the ground."
If you're wondering about the specific mechanics of how gravity works, it's described by Isaac Newton's law of universal gravitation. According to this law, the force of gravity between two objects is directly proportional to the product of their masses (the amount of matter they contain) and inversely proportional to the square of the distance between their centers. In simpler terms, the more massive an object is, the stronger its gravitational pull, and the closer you are to it, the stronger the force of gravity you experience.
So, to summarize, it is the force of gravity between Earth and all objects on it that enables us to stay on the ground.