-- Heat conduction can, like when you put a hot iron down
on the metal block.
-- Radiation can, like when you put the block outside
in the sun.
-- Electric current can, like when you connect wires from
the block to both terminals of a battery.
-- Doing mechanical work on it can, like when you carry the block
upstairs to your bedroom, giving it gravitational potential energy.
-- Motion can, like when you drop the block out of your bedroom
window, and the force of gravity gives it kinetic energy.
