What's the deal with Relativistic Mass?
29290
Why is there a controversy on whether mass increases with speed?
137061
Understanding the different kinds of mass in gravity
68831
Why mass terms are forbidden?
42291
Why is spacetime curved by mass but not charge?
44566
Is (rest) mass conserved in special relativity?
4789
Apparent Violation of Newton's $3^{\text{rd}}$ Law and the Conservation of Momentum (and Angular Momentum) For a Pair of Charged Particles
78258
How Special Relativity causes magnetism
80645
Time for two relativistic objects to meet
82362
Is there a fundamental reason why gravitational mass is the same as inertial mass?
61603
Why is the Yang–Mills existence and mass gap problem so fundamental?
37216
How can one motivate the relativistic momentum?
2366
Is acceleration relative in relativity?
108384
Special Relativity and $E = mc^2$
155913
Lagrangian for free particle in special relativity
110266
Quarks in a hadron: where does the mass come from?
30041
What is "special" and what is "general" in Relativity?
23729
Four-velocity in General-relativistic geodesic equation