The optional diversifiers for the jam are: 

Losing Momentum 

That Looks Like It Hurts 

Load Bearing 

The More You Have The Worse It Is 

Ricochet

These are optional diversifiers, in a sense "Physics" is already the theme for this jam, but if you want an extra constraint to narrow your options and inspire you to try something different, please pick one of these. You can pick multiple optional diversifiers if you want to really challenge yourself, but if you already know what you want to make and it doesn't fit with any of the diversifiers you're also welcome to fo that.