Hello!
An example of a physical change would be an ice cube melting, as well as an ice cube forming. When an ice cube melts, it is converting from a solid to a liquid. The substance(s) that make up the ice cube have remained the same, but its appearance is very different. As well with an ice cube forming, the water making the ice cube is still the same substance, instead of just being a liquid, it turns into a solid.
I hope this helps!