Running on Trains: Secret Agent Series 2
Classical Mechanics
Level
1
You are running away from the evil villain Valdoz, and you're in the middle of a subway. So you jump on top of a train and try to move forward, but you just can't. Which of these forces is acting on you the most? The train is moving at 20 m/s
Gravity
Friction
Air drag
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1 solution
Common sense, I guess. Friction is always present, but here the train is moving quite fast, meaning friction isn't acting on you the most. Gravity, ok... same as friction it is always present and always acting on you, but in this case (using common sense) it isn't the main force acting on you.
Which leaves Air drag. THE TRAIN IS MOVING AT 20M/S or 72KM/HR. Meaning air drag is acting on you the most.