Gravity and Gravitational Force

Gravity: Earth's Invisible Superpower

Right now, as you're reading this, there's an invisible force pulling on every single atom in your body with the strength of about 100 pounds (if you weigh 100 pounds). This force never stops, never takes a break, and works on everything around you. What is this mysterious superpower? Gravity.

Gravity is a force that pulls all objects toward Earth's center — that imaginary point about 4,000 miles beneath your feet. Think of Earth as a giant magnet, except instead of attracting metal, it attracts everything with mass. Your pencil, your desk, the air you breathe, even the Moon orbiting overhead — gravity is constantly tugging on all of it.

The Great Gravity Mystery

Here's where gravity gets really interesting. Drop a feather and a rock from the same height. What happens? The rock hits the ground first, right? You might think heavier objects fall faster, but gravity has a secret that even fooled ancient scientists for centuries.

But gravity isn't the same everywhere. The higher you go above Earth's surface, the weaker gravity becomes. At the top of Mount Everest (29,032 feet up), you'd actually weigh about half a pound less than at sea level! Astronauts on the International Space Station, orbiting 250 miles above Earth, experience such weak gravity that they float weightlessly.

Gravity's Shape Game

Gravity pulls on all objects equally by mass, but their shape determines how they move through air. A crumpled paper ball falls faster than a flat sheet of paper with the same mass because air resistance affects them differently. This is why skydivers spread their arms and legs to slow down, then tuck into a ball to speed up.

On the Moon, where gravity is only one-sixth as strong as Earth's, everything changes. That amazing basketball shot that barely reaches the hoop here? On the Moon, you'd launch the ball clear over the backboard! A simple hop that lifts you 2 inches off the ground would become a 12-inch leap in the Moon's reduced gravity.