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Unformatted text preview: e that only the vertical height is important. Moving an object 100 meters sideways does not
change the gravitational potential energy because the force of gravity is perpendicular to the motion and
therefore does no work on the object.
The amount of gravitational potential energy an object has is a relative quantity. Its value depends
on how we define the height—that is, what height we take as the zero value. We can choose to measure
the height from any place that is convenient. The only thing that has any physical significance is the
change in gravitational potential energy. If a ball gains 20 joules of kinetic energy as it falls, it must lose
20 joules of gravitational potential energy. It does not matter how much gravitational potential energy it
had at the beginning; it is only the amount lost that has any meaning in physics. 3.0
5. References Introductory Physics. Building Understanding by Jerold Touger. Wiley Publishing
Fundamentals of Physics 7th edition by Halliday, Resnick, and Walker. Wiley...
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