What Is Gravity? Why Things Fall Down
Gravity is the invisible pull that every object with mass has on every other object. The Earth is so massive that its pull keeps us and the air around the planet in place, and makes a dropped apple fall straight down. The more mass an object has, and the closer you are to it, the stronger its pull.
Why would you weigh less on the Moon?
Because mass and weight are different things. Mass is the amount of “stuff” in an object, and it stays the same wherever you go. Weight is how hard gravity pulls on that stuff, so it changes from place to place. The Moon has about 80 times less mass than Earth, and its gravity is about six times weaker. So if you weigh 45 kg on Earth, you would weigh only about 8 kg on the Moon.
Key facts
- Gravity always works both ways: even the Earth pulls a tiny bit on the Sun.
- Mercury’s gravity is about a third of Earth’s.
- Earth’s gravity holds our atmosphere in place.
How does the Moon make tides?
The Moon’s gravity pulls on Earth’s oceans, making a bulge of water on the side facing it and a second bulge on the far side. As the Earth spins through these two bulges, coasts get two high tides a day. The Sun pulls on the oceans too, but it is so far away that its tug is only about half as strong. When the Sun and Moon line up, they pull together and make the biggest tides, called spring tides.
Is gravity a strong force?
Surprisingly, no: gravity is the weakest force in nature. You beat the pull of the whole Earth every time you jump, and a small fridge magnet can hold up a photo without dropping it. Gravity only seems powerful because it never stops. It keeps pulling on everything, everywhere, all the time.
Where can I read the full story?
This is a short version of “Gravity: An Invisible Attraction” from OYLA Junior #15 (October 2026). The full article in OYLA Junior includes a chart of your weight on every planet and a magnet experiment that seems to defy gravity.
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