There are a lot of forces that affect a bobsleigh race, if that's what you mean. There's friction between the skates and the track, drag of the sleigh against the wind as well as wind pressure, and gravity. Around the curves, bobsleighs experience centrifugal force (outward "push"). This is why, when watching bobsleigh races, you will often see a bobsleigh move up and down on a curve to find the perfect line (moving up and down is not good though...).
When they start, they have to push the entire bobsleigh from stop for about 50 meters, so the crewmen are necessary. Also, around turns, when the front man steers, the crewmen lean to a side on the curves to help stability and other stuff.
When they start, they have to push the entire bobsleigh from stop for about 50 meters, so the crewmen are necessary. Also, around turns, when the front man steers, the crewmen lean to a side on the curves to help stability and other stuff.