inertia

nouns

a disposition to remain inactive or inert
"he had to overcome his inertia and get back to work"
(physics) the tendency of a body to maintain its state of rest or uniform motion unless acted upon by an external force
domain category
the science of matter and energy and their interactions
"his favorite subject was physics"
is a type of (narrower)
a physical phenomenon associated with the equilibrium or motion of objects