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Mass is both a property of a physical bodyand a measure of its resistance to acceleration (a change in its state of motion) when a net force is applied. It also determines the strength of its mutual gravitational attraction to other bodies.
any stationary body having mass has an equivalent amount of energy, and all forms of energy resist acceleration by a force and have gravitational attraction. In modern physics, matter is not a fundamental concept because its definition has proven elusive.
The mass of an object determines its acceleration in the presence of an applied force.
A body's mass also determines the degree to which it generates or is affected by a gravitational field.
originally posted by: BELIEVERpriest
a reply to: burgerbuddy
That's my assumption, but I also don't believe photons are really "massless", but have a ground state non-zero mass that we can't measure yet.