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Unit 1: What is Energy?
Section B. Two Main Forms of Energy
The energy we sense all around us seems to have many forms. Fires burn, rubber bands snap back, flashlights turn on and shine, objects fall, and things appear to be hot, cold, or just the right temperature. With so much going on, how can we figure out what forms of energy these things and events have? After hundreds of years of observation and experimentation, science has classified energy into two main forms: kinetic energy and potential energy. In addition, potential energy takes several forms of its own.
Kinetic energy is defined as the energy of a moving object. A thrown football, a speeding automobile, a marathon runner, or a rock falling from a cliff, are examples of objects that have kinetic energy.
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Potential energy is defined as the energy associated with the arrangement of a system of objects that exert forces on one another. Potential energy is stored or released when the arrangement of the objects and/or the forces they exert on each other changes in some way. Systems of objects ranging from atoms to planets can be arranged in many ways, resulting in many forms of potential energy: chemical, elastic, electrical (electromagnetic), gravitational, nuclear, and thermal energy.
Although potential energy is often referred to as "stored" energy, two misconceptions may arise when referred to in this way. First, saying that energy is stored in something may imply that energy is some sort of invisible substance, which it isn't. Second, consider a textbook held above a classroom floor. Many would say that the textbook has potential energy stored within it, and it is often convenient to think that only the textbook has potential energy. However, the textbook has potential energy because it is part of a system that includes the Earth, one in which both exert gravitational forces on each other. In other words, the textbook would not have potential energy if it were not for the Earth.
Explanation:
yong NASA pic po ty
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