=You have no clue what you're talking about and have a monster lack of logic and reasoning.
Of course, in physics every force has an equal opposite force that's Newtonian physics. But I think you're confusing basic elementary particle physics with human emotions and interaction. There are so many flaws in your logic I don't even know where to begin.
First, if you're serious about karma being decided by unalterable physics then how do you explain that some good people get nothing but shit all their lives and people like Josef Mengele (aka doctor of death in nazi conc. camps) gets away with his horrible acts and gets to spend a casual life in brazil? Doesn't seem to be any absolute truth there which basic physics demand.
Newtonian physics are great to explain why a rifle has a recoil when you shoot it but it's absolutely worthless when it comes to human social interaction. If I go to some random fat guy (you perhaps?) and make him feel so bad about himself with my nasty words resulting in his suicide and I get hit by a bus two days later, you would call it karma. But that also means that whatever force I pushed on the fat guy somehow took 48 hours to give an equal force back. Doesn't sound like logical physics to me. 
I can't believe I'm even taking the time to write all this, feel honored you prick.
hahahahahahaha meltdown of epic proportions, now that you have been owned by science.
and yes i feel honoured a retard is trying desperately to justify that there is no order or reason in the universe, by resorting to calling me a fool and fat guy hahahahahaha

1st - there are no flaws in my logic, every force DOES have an equal and opposite reaction.
2nd - its not difficult to understand why some people get shit on most of their lives. They have had a good past life and karma is now balancing it out - or they have been assholes to other is a past or present life and are paying the price.
As gracie's post earlier explains.
You really should not melt down so easily when someone disagrees with your beliefs.
If you feel we are all put here by chance, with no logic or order and its every man for himself. how many people have you killed ? how many people have you robbed ? how many women have you raped? how many people have you beaten ? if there is nothing else why do you obey laws ? why do you have a conscience ? what is the point in living by rules when you can do and say anything with no comeback or punishment ?