Gravity, gravitational force, mass, weight
Gravity is a natural force that pulls everything toward everything else. On Earth, it pulls us, the air, and objects toward the ground, which is why we don’t float away.
In simple words: gravity is what keeps your feet on the ground and makes things fall when you drop them.
What does it do?
It keeps planets orbiting the Sun. Without gravity, Earth would drift into space.
It holds the Moon around Earth, making tides in the oceans.
It pulls objects together, helping stars and planets form.
It even affects light slightly in space, bending it near massive objects.
Gravitational force is the pull between any two objects that have mass.
In simple words: it’s the invisible tug that makes things fall, keeps you on the ground, and makes planets orbit the Sun.
The bigger or heavier the objects, the stronger the pull between them.
For example:
Earth pulls you down.
The Sun pulls Earth, keeping it in orbit.
Mass:
How much stuff is in an object.
Measured in kilograms (kg).
Stays the same everywhere (on Earth, Moon, or in space).
Weight:
How strongly gravity pulls on that stuff.
Measured in newtons (N).
Changes depending on gravity. For example, you weigh less on the Moon because its gravity is weaker.
Simple way:
Mass = amount of stuff
Weight = pull of gravity on that stuff