# Is mass directly or inversely proportional to time? [closed]

1. From a Newtonian perspective:

• F = ma
• F dx = ma dx
• E = m (dv/dt) dx
• m = (E dt) / (dv dx)

Mass is directly proportional to time, if time slows down then mass goes down or decreases.

1. From a Relativistic perspective:

• Approaching c, time slows down and mass goes up or increases. Mass is inversely proportional to time.

Irrespective of what speed you are travelling, the fundamental relationship between mass and time should remain. So is mass directly or inversely proportional to time?

• My mass seems to increase with time (sigh)... But, you can perform math manipulations on any equation, but that doesn't mean that they are physically meaningful. Commented Jan 18, 2016 at 15:30
• Interesting application, since mass increases with increased velocity then it stands to reason that you can lose weight by sitting on the couch watching the big bang theory... I should submit that theory to weight watchers magazine. Commented Jan 18, 2016 at 21:34
• Well actually, from your rearranging, shouldn't mass proportional to $dt$ rather than time? I don't see time appearing anywhere Commented Jan 18, 2016 at 22:33