he is roasting a marshmallow which is chemical change
If you saw the last picture then you should know this is a chemical change.. You may ask ¨Why¨ and the reason is that it isn't just changing shape its also changing the chemicals inside the object making it a new substance.
he is bashing and changing the shape of the clay physical change
Now as you may have saw I was changing the shape of the clay they call this a physical change. A physical change is a change in matter and when the object changes shapes but does not change its chemical, it can often be redone.