During the movie and the early seasons of Stargate SG1, travel through the Stargate from Earth is an extremely bumpy ride, often resulting in the feeling of being chilled, being thrown out of the Stargate upon arrival, etc.
It is covered in Stargate SG1 that an object in motion maintains its velocity when travelling through the gate - if this is the case then surely in order to be thrown out of the gate at your destination you'd have to take a running jump on entry at your source.
Since this doesn't seem to be the way the team enters the Stargate on earth, why is travelling through the Stargate from Earth such a bumpy ride?