Iron Man's suits displays a wide array of advanced technologies:
- amazing artificial intelligence,
- virtually unlimited energy via the ARC reactors, and
- repulsor technology
The repulsors enable flight as well is providing an offensive weapon which can be used to fire damaging blast and as well as to throw/push objects and enemies with significant force.
Now, I'm quite sure we've seen significant cases where he exerts the push without being braced against a solid object or using other repulsors for their counter-reaction.
Now, of course, Newton's Third Law of Motion states:
When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.
or colloquially, this is often rendered as
For every action there's an equal and opposite reaction.
Now, clearly comic book heroes violate real-world physics all the time in any number of ways. The question is about whether this violation is an actual characteristic of the repulsor technology (in-universe). So:
- Is there an undeniable instance where Iron Man's repulsors violate Newton III?
- Is this just a normal bad comic book/movie physics situation or does the technology actually overcome this law of physics in-universe (or have some other in-universe explanation)?
Here are a few blasts (at the 33s mark) where the reaction force is clearly not at all proportional to the blast: