Mass is how much stuff something has inside it.
Imagine you have two toy boxes. One is full of soft, fluffy stuffed animals, that’s like a light mass. The other box is packed with heavy rocks, that's like a heavy mass. If you tried to lift them, the rock box would feel harder to move because it has more stuff inside.
What makes mass different?
- Big things usually have more mass than small things. Like how your backpack feels heavier when you put all your toys in it compared to just a pencil.
- Heavy materials add more mass. A metal spoon has more mass than a wooden one, even if they're the same size.
Think of mass like the "weight" of something, but not exactly the same. When you’re on the moon, you weigh less because gravity is weaker, but your mass stays the same, just like your toy box always has the same amount of stuff inside no matter where you take it.
Examples
- A ball has more mass than a feather, so it falls faster when dropped.
- Mass is like how much 'stuff' is inside an object, the more stuff, the bigger the mass.
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See also
- What is Newton’s law of universal gravitation?
- Why does gravity make things fall?
- What If We Dug a Hole All the Way Through Earth?
- How Do Tides Work in Space?
- How Does Gravity Shape the Formation of Stars?