What Do You Mean Mass is Energy?

Mass is energy, that means when something gets heavier, it’s because it has more energy inside it.

Imagine you're playing with a super strong spring. When you push it together, it gets tight and stores up energy. If you let go, it pops back out, that’s the energy moving! Now think of your body as that spring. When you run around or laugh a lot, you're using up energy, but sometimes you store more inside, like when you eat candy. That extra energy makes you feel heavier, kind of like how the tight spring feels harder to push.

Everything in the world is like that spring too. When things get really energetic, they also get a little heavier. Scientists use special tools to see this happen, but it's just like your body storing energy when you're full of fun! Mass is energy, that means when something gets heavier, it’s because it has more energy inside it.

Imagine you're playing with a super strong spring. When you push it together, it gets tight and stores up energy. If you let go, it pops back out, that’s the energy moving! Now think of your body as that spring. When you run around or laugh a lot, you're using up energy, but sometimes you store more inside, like when you eat candy. That extra energy makes you feel heavier, kind of like how the tight spring feels harder to push.