I've been trying to work on a physics engine in scratch, but I've ran into several problems.
First, there is no efficient way to do pixel-based physics, i.e. displaced dirt and water.
Second, it would be next to impossible to use Pixel art in this, unless you knew exactly how many pixels away from the main "body", and/or the rotation center.
Is there any way that either of these could be implemented without modifying Scratch?
...I mean aside from each pixel being a different sprite...
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Can you describe what you are trying to simulate in your physics engine? It may be easier to figure out a possible suggestion to your problem if I knew the goal you are trying to achieve.

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Your best bet is to create a number of pixel sized sprites and teach them how to react to their enviroment
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It would depend on the number of object if you are talking like particle spray - there is probably not enough power - if you are talking about simulating a few orbits odds are better.
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