What decides that "it (mass energy) " is going to become mass or energy?
22168
What keeps mass from turning into energy?
142441
If rest mass does not change with $v$ then why is infinite energy required to accelerate an object to the speed of light?
122561
Is the energy always discrete?
84892
What truly is mass, and is there a direct way to measure it?
145238
Where does the energy required to stop a moving body come from and go?
139513
Elastic potential energy and equilibrium position when mass changes in vertical mass-spring system
112366
Is mass an observable in Quantum Mechanics?
112625
Reduced mass in quantum physics (Hydrogen Atom)
103498
Does decrease in temperature affect mass $E=mc^2$?
20045
What is the best way to explain how to choose between "its" and "it's"?
19783
Why does a system try to minimize potential energy?
58978
Work done relation to potential energy
96324
Does everything with mass or energy have a gravitational pull?
146039
Is it always possible to define energy of a system?
59594
Binding energy and mass
80329
How is dark energy consistent with conservation of mass and energy?
119581
How to understand whether potential energy increases or decreases?