0 Members and 1 Guest are viewing this topic.
What causes an object in pure free space to move in a straight line with constant velocity?
Quote from: jerrygg38 on 21/08/2016 16:38:44What causes an object in pure free space to move in a straight line with constant velocity?Only the choice of coordinates.Seriously, whether or not something is moving or not, and how it is moving, it an arbitrary choice. Once we make this choice, we can define forces to be that which causes something to change its motion.
Why does a mass in motion tend to move in a straight line at constant velocity?
This apparent contradiction is resolved if spacetime is curved by mass. As relativistic mass increases then so does the gradient of this curvature. Welcome to general relativity.
Quote from: jerrygg38 on 19/08/2016 14:23:00Why does a mass in motion tend to move in a straight line at constant velocity? The simple answer is because that is the way it is travelling unaffected by external forces.
But I am not happy by the simple answer. Why does a photon travel in a straight line?
Quote from: jerrygg38 on 07/09/2016 14:30:36 But I am not happy by the simple answer. Why does a photon travel in a straight line? There is no complex answer to an object travelling a linearity, however a Photon if they actually exist may be another story. We can't really see Photons because they are ''invisible'', so what says they do travel in a straight line?
If wevery mass is radiating energy, where does the energy come from and how long does it last? And since radiation generally exerts an outward force, how come that gravity sucks?