A person drops a ball in a train traveling along a straight, horizontal track at a constant velocity. What would the person in the train say about the horizontal forces acting on the ball?
a. There are no horizontal forces acting on the ball.
b. There is a fictitious (inertial) force acting forward.
c. There is a fictitious (inertial) force acting backward.
d. There is a centrifugal force.
Perhaps if the ball on the train dangles from a string and the string is cut it is more obvious to any confused students that there is no sideways force?
I read emakarov's Meowton post. I hope that one day I too am so confident that I'm respected that I can talk nonsense without being afraid that people will think I'm an idiot.