In the motion picture It Happened One Night, Clark Gable is standing inside a stationary but in front of Claudette Colbert, who is seated. The bus suddenly starts moving forward and Clark falls into Claudette’s lap. Why did this happen?

Answer 1

lAW OF INERTIA: An clark which is not in motion, will stay not in motion until a force acts on it.

the train moved, clark did not. Claudette moved also, right underneath Clark.