Why do molecules vibrate more rapidly?

Molecules vibrate more rapidly when they get warmer, just like you bounce more when you're excited.

Imagine you and your friend are on a trampoline. When you both jump in, you bounce around together, that's like molecules moving and vibrating. Now, if someone turns up the heat in the room (like a warm, cozy blanket), you both start jumping higher and faster. That’s what happens to molecules when they get warmer, they vibrate more rapidly because they have more energy.

Think of molecules as tiny balls connected by springs. When you add heat, it's like giving those balls a push, they start moving faster and stretching the springs more, making them vibrate more intensely.

If you put ice in your hand, it feels cold because the molecules are moving slowly and not vibrating much. But when that ice melts into water, it starts to feel warmer, the molecules are now zooming around more quickly!