New in town?

(This one is an excerpt from a story back when I was living in Germany)

Just to add another Bahn to the story, I proceeded to test Newtons laws on the conservation of momentum on the strassen Bahn on my way to work... this is how you do it: 1) apply minimum friction surface to body's support (ie put on a pair of Roller blades with well lubricated bearings). 2) Place body at stern of vehicle (get on at the front of the train). 3) Allow vehicle to accelerate (train pulls out of stop). 4) Make sure the observation is not biased (Make sure there are lots of people on the train to watch). 5) Apply frictional force to upper part of body (grab hold of any thing that might stop you). 6) Observe as lower part of body conserves momentum (Watch legs fly). 7) Reset the body on friction free surface (stand up). 8) Observe how body does not have the same momentum as the vehicle, since vehicle is still accelerating (try again). 9) Apply friction to lower part of body (whack legs/shins into plastic seats). 10) Observe as upper body conserves momentum (sit down facing the seat).
The principles of Newtons Laws, never leave home without them!