I realize the locking mechanism in “P” prevents the car from moving but how does it move in “D” in the first place? The car is turned off! There is no ignition to the engine!
In: Engineering
“D” is pretty much “N” just with a bit more force required to make it move. But we’re talking up to 2 tons of metal and plastic here, sitting on 4 things specifically invented for the purpose of moving. Add in gravity and boom you now have a moving car.
Also your street may seem level, it’s probably not as level as you imagine. A 10 degree incline as huge as your whole neighborhood probably just looks flat to you, it does not look flat to physics.
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