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GR explains the Eotvos experiments.
The equation is about the physical concepts of mass and energy.
The equation is about the physical concepts of mass and energy.
Mass refers to what is often called "inertia" (though that term is used much less now than it was 100 years ago). It is sometimes called "inertial mass". Inertial mass is the resistance of an object to being accelerated when a force is applied. The "m" in E=mc^2 is the same as the "m" in Netwon's formula of motion F=ma. Gravitational mass is what makes things "heavy", that is, what is acted upon by gravity. It is the "m<sub>1</sub>" and "m<sub>2</sub>" in Newton's formula for gravity <math>F = \frac{Gm_1m_2}{d^2}</math>. The difference between inertial mass and gravitational mass used to be a burning issue among physicists, eventually being tested, and found to be the same, by the famous Eotvos experiments.
Mass refers to what is often called "inertia" (though that term is used much less now than it was 100 years ago). It is sometimes called "inertial mass". Inertial mass is the resistance of an object to being accelerated when a force is applied. The "m" in E=mc^2 is the same as the "m" in Netwon's formula of motion F=ma. Gravitational mass is what makes things "heavy", that is, what is acted upon by gravity. It is the "m<sub>1</sub>" and "m<sub>2</sub>" in Newton's formula for gravity <math>F = \frac{Gm_1m_2}{d^2}</math>. The difference between inertial mass and gravitational mass used to be a burning issue among physicists, eventually being tested, and found to be the same, by the famous Eotvos experiments. (With the advent of general relativity, we know know why they are the same, but that's not important just now.)
Energy refers to kinetic energy of motion, or radiated energy.
Energy refers to kinetic energy of motion, or radiated energy.