Final answer:
The force due to hammering alters the physical properties of the iron by imparting kinetic energy and causing it to heat up.
Explanation:
The force due to hammering affects the piece of iron by altering its physical properties. Each strike from the hammer imparts kinetic energy, causing the iron to heat up due to increased molecular motion. This heating effect can lead to changes in the iron's structure such as work hardening, making it stiffer and more durable.
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