Is there an upper limit on velocity when using box2d?

Question

I\'m using box2d for physics simulation. I\'m moving a circle using arrow keys by applying impulse on the body when ever a key is pressed. Unfortunately, the circle moves ex

Answer 1

Yes, there is a difference between which size do you use. Box2d operates over floating point numbers and thus it's precision is limited and simulation quality differs. Box2d is tuned to work best with dynamic bodies of size 0.1 to 10.

So generally you should prefer to use one units for physics and other for graphics

Now to your question. Body's velocity is affected by collisions, friction (if one body is sliding over the other) and by linear damping. So check what value for linear damping do you use (it's non-zero by default as I remember). There are no velocity limitations, as far as I know, but higher velocity will provide less quality collisions if using the same time step.