weight ? for Pinewood derby car builders

[Zoomschwortz]

Originally Posted by Gone Dave

This is my first time to build a car with my son, and I am looking for some rocket science here..
My question is this, after construction I need to add some ounces, does it make a speed change if I put it in the front, center mass, or rear??

I always put it low and near the center to try and keep the weight on all 4 wheels equal.

Make sure you polish them axles and sand them wheels so the contact surface is kept to a minimum as well.