49. In what direction does the force of friction act?
1 answer:
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Answer:
0.39
Explanation:
In order not to slide, you must have exactly the same acceleration of the train:
where
g = 9.81 m/s^2
There is only one force acting on you: the static frictional force that "pulls" you forward, and it is given by
According to Newton's second law, the net force acting on you (so, the frictional force) must be equal to your mass times the acceleration, so we have
from which we find
so, the minimum coefficient of static friction must be 0.39.