Relativity
Special Relativity
Does not work in gravity
Does not allow any forces
Shows relation between observer, speed and time.
Published in 1905
Simple and covers less of the universe
General Relativity
Works in gravity,
allows and accounts for acceleration
Shows relation between observer and acceleration
Spacetime tells matter how to move and matter tells spacetime how to curve.
Spaetime around the Earth is curved due to the planet's gravity
SPace and time are the same but with different characteristics, thus spacetime
Gravitation of force in and around the area of the object/observer. the energy momentun if the object's matter causes the curve. The relation between matter and space time is such that they tell each other how to behave.
Einstein then modified Newton's first law. Spaetime is curved though, so the shortest curve will suually be curved and not straight. However, this is not the final change to Newton's third law. (not the final change
Time dilation
If light speed is constant, then even though length AB > CD have the same speed has the light travelling on AB.
Light travelling on CD has more distance by using less time
Einstein managed to comibvu e GR, Gravity and acceleration by making a connection between these forces.