Day 2: The Bedrock of Gravity

1. The Unbreakable Laws

Gravity is a force that pulls objects toward each other.

• Law 1: Mass attracts mass. The more mass an object has, the stronger its pull.
• Law 2: Distance matters. The closer two masses are, the stronger the pull between them.

Analogy: Imagine two magnets on a table. The bigger the magnets, the more they pull on each other. If you push them farther apart, the pull weakens, just like gravity.

FIRST PRINCIPLE:
“Gravity is a force that pulls masses together.”

2. The Simple Formula

The force of gravity between two objects is calculated with
F = G × (m₁ × m₂) ÷ r²

• G is a tiny number that makes the equation work for the universe.
• m₁ and m₂ are the masses of the two objects.
• r is the distance between their centers.

The formula shows two key ideas:

1. More mass = stronger pull.
2. More distance = weaker pull.