* Physical Change: A change in the form or appearance of a substance, but not its chemical composition.

* Chemical Change: A change where a new substance is formed with different chemical properties.

Pressing car fenders involves:

* Shape Change: The metal is bent or reshaped.

* No New Substance: The metal itself doesn't change its chemical composition. It's still the same type of metal.

Examples of Chemical Changes:

* Burning wood (wood turns into ash, carbon dioxide, and other products)

* Rusting of iron (iron reacts with oxygen to form iron oxide)

Therefore, pressing car fenders is a physical change because it only alters the shape of the metal, not its chemical makeup.