What was Einstein's 'extremely simple' concept about the mass of objects?

What was Einstein's 'extremely simple' concept about the mass of objects?

• A. It bends space and time
• B. It creates gravity as a force
• C. It travels faster than light
• D. It has no relation to gravity

Answer: (A)

The main idea is that mass changes the geometry of spacetime, and that geometry tells objects how to move. In Einstein’s view, mass-energy curves spacetime, and freely moving objects follow straightest possible paths in that curved spacetime. This is why gravity isn’t a separate force but a consequence of curved spacetime around massive objects. So describing mass as bending space and time captures the essence of how mass influences motion. The other statements describe a Newtonian force, an unrelated speed claim, or deny any link to gravity, all of which don’t fit Einstein’s view.

The main idea is that mass changes the geometry of spacetime, and that geometry tells objects how to move. In Einstein’s view, mass-energy curves spacetime, and freely moving objects follow straightest possible paths in that curved spacetime. This is why gravity isn’t a separate force but a consequence of curved spacetime around massive objects. So describing mass as bending space and time captures the essence of how mass influences motion. The other statements describe a Newtonian force, an unrelated speed claim, or deny any link to gravity, all of which don’t fit Einstein’s view.