Question: (a) If the horizontal acceleration produced by an earth-quake is a, and if an object is going to hold its place on the ground, show

(a) If the horizontal acceleration produced by an earth-quake is a, and if an object is going to “hold its place” on the ground, show that the coefficient of static friction with the ground must be at least μs = 1/g.
(b) The famous Loma Prieta earthquake that stopped the 1989 World Series produced ground accelerations of up to 4.0 m/s2 in the San Francisco Bay Area. Would a chair have started to slide on a linoleum floor with coefficient of static friction 0.25?

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