mechanics math

Here so I don't have to search the internet to look for this stuff.

I'm working on some physics things for my swarm AI... tricky since I haven't done any of this for ehm... 15 years or so.

Second law of Newton

F = m * a
a = F/m
m = F/a

F is force in newtons
m is mass in kilograms
a is acceleration in meters per second