Originally posted by Accel
That's some very logical reasoning, but the problem here is that you're trying to apply real life physics into comics, which isn't healthy.

Remember, Flash possesses one of the biggest plot devices in comics- the Speed Force. Every thing Flash does is explained by the Speed Force, whether he runs at the speed of sound without causing sonic booms, runs at the speed of light without causing himself harm, punching super-durable characters without breaking his arm, etc. The ability to steal someone's speed is just another quality available through the Speed Force and Thor has no defense against it. Wonder Woman has shown to be immune to the power, since she gets her speed from the God os Speed, Hermes (logically, this should also mean Captain Marvel is immune to it since his speed comes from Mercury), but Thor, despite being an actual god, has no luxury such as that so he has no immunity.

Given the explanation of the speedforce, the source of all kinetic energy, it should pretty much work on anyone. I dunno, Wonder Woman as a whole is a pretty good plot device, lol.