If oscillation and waving are added to these three motions, the net affect will approximate the movement of the ground that might be felt by a person during an earthquake. This circular action combined with both the pendulum motion and an up-and-down motion are the three most fundamental movements in nature. If the force, however, hits the weight at anywhere other than at the lowest point in its path it will not create another pendulum but a circular motion. If the weight is hit by a force at the lowest point in its path to the earth, that action will create another pendulum going in the direction opposite the force, due to the simple Newtonian explanation that for every action there is an equal reaction. “Consider a weight on a string, swinging back and forth like a pendulum.
Show More his depth with his description of the physics of earthquake ground shaking: Told with verve and a seasoned firefighter's knowledge, San Francisco Is Burning is the gripping and definitive account of one of the greatest disasters of the twentieth century. Throughout, Smith reveals many unknown details about the event, from the city's great vulnerability to fire-due to its corrupt and hasty building practices-to the widespread racism the quake unleashed and the atrocities committed by national guardsmen. Smith cinematically recounts this terrible tragedy through the stories of the people who lived through those terrible days-from a valiant naval officer who helped save the city's piers and wharves to Eugene Schmitz, the crooked mayor, to the "debonair scoundrel" Abe Ruef, the most erudite city boss in American history. This watershed event in American history has never before been told with the richness of historical detail and insight that our foremost historian of fire, Dennis Smith, brings to it in San Francisco Is Burning. In all, 522 blocks and 28,188 buildings were leveled, and some 200,000 people dislocated. The ensuing fires that ravaged the city for days were responsible for the deaths of as many as 3,000 more. on the morning of April 18, 1906, San Francisco was struck by one of the worst earthquakes in history, instantly killing hundreds.
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