Answer:
The reason this is more effective than hammering the hot metal on the surface of a thin steel plate is "the massive anvil has more inertia".
Step-by-step explanation:
The anvil will be more resistant for the hammering force, because it have bigger mass, so having much greater tendency to stay at rest. This is an instance of inertia. It is any physical object's resistance to any variations in its velocity. This is comprised of changes to the velocity or direction of motion of the object.
In physics the law of inertia also known as the first law of Newton, postulates that if a body is at rest or moving at a constant speed in a straight line it will remain at rest or keep moving at a constant speed in a straight line unless a force acts upon it.