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Unformatted text preview: es the car travel during this time period? 10 Physical Science 1 Chapter 2 FREE FALL · Galileo quest ioned Aristotle’s view that objects fell because of their “earthiness”. According to a popular story, he dropped stones of different masses fro m the tower of Pisa and determined experimentally how mass o f objects affected their rate of fall. · Galileo was the first person to correctly understand the motion of bodies falling under the force of gravity (free fall). · In free fall, no force other than gravity acts on the object. (Air resistance is ignored for simplificat ion). · In free fall, all objects fall to the ground at the same rate, 2 regardless of mass. They accelerate at the rate of 9.8 m/s (g). Velocit y and distance of falling objects can be determined by using the fo llowing two equations: 1 d= gt 2 2 v=gt where g = gravity » 10 m/s2 Examples: th 1. A book falls fro m the balcony of a 12 ­floor apartment and smashes to the ground 3.0 seconds later. a) How fast is it moving just before it hits the ground? v = gt = (10 m/s2 ) (3.0 s)= 30 m/s b) What distance...
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