Ch_322a_3.012 - Energy Changes The physical world is...

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Energy Changes The physical world is described in terms of matter and energy . Matter is the physical stuff around us. It occupies space, has mass, and can be measured by various methods. Energy is not always observable. Types of Energy Energy is the capacity to do work. The two general categories are kinetic and potential energy. Kinetic energy is the capacity to do work by a moving object : Kinetic Energy = (1/2) mv 2 where m is the mass of the object and v is its velocity . The moving object may be as small as an electron. Potential energy is stored energy such as the energy of chemical bonds. Kinetic and potential energy are interchangeable .
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An Example: two balls attached to the ends of a spring We can define the relaxed position of the spring as zero kinetic energy and zero potential energy. relaxed position KE = 0 PE = 0 As the spring is stretched, work is being done on it, and energy is transferred into the spring. The expanding spring has kinetic energy (moving mass) which is being converted into potential energy.
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