Park the Car in Harvard Yard
Posted on 2010-08-20
Well, not in the Yard actually, but on a hill nearby.
We have a car parked on a slope. Assuming that the car is symmetric and all four wheels have the same size and assuming that the friction on rolling is negligible, what is the condition that either the back brakes or the front brakes should be activated to stop the car rolling down the hill.
(We are assuming that only one set of brakes may be activated, the front brakes are those further up the hill)