Inertial Mass
A measure of an object's intrinsic resistance to changes in its velocity when subjected to a net force.
Governing formula
m = F / a
SI unit
kg
In depth
Inertial mass appears in Newton's second law (F = m a). Higher inertial mass requires greater force to achieve the same acceleration.
Examples in the real world
Pushing a stalled truck requires vastly more force to accelerate than pushing a bicycle due to the truck's larger inertial mass.