The hammer heats up when it is hit, for example, on an anvil, and when it lies in the sun on a hot summer day

The hammer heats up when it is hit, for example, on an anvil, and when it lies in the sun on a hot summer day. What are the ways to change the internal energy of the hammer in both cases?

When a hammer is hit on something, then its kinetic energy upon impact is converted into thermal energy, part of it is spent on the frictional force upon impact. Thermal energy increases the internal energy of the hammer and anvil.

When the hammer is heated by the sun’s rays, infrared radiation from the sun acts on it, this leads to an increase in internal energy through thermal conduction and an increase in the average temperature of the hammer.