Conservation of Energy

Notice that only the vertical height is important

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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 1. 2. 3. 4. 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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This document was uploaded on 03/20/2014 for the course PHYS 215 at Lafayette.

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