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Conservation of Energy (12.4) Notes Energy Potential energy can become ____________ energy, and kinetic energy can _____________ potential Trans- energy. Label the rollercoaster to show where the car has the greatest and least amount of potential and formations kinetic energy. Give two other examples in which potential energy is being transformed into kinetic energy and/or viseversa. 1. ____________________________________________________________________ 2. ____________________________________________________________________ The Law of State the law in its simplest form: _______________________________________________ Conservation of Energy The law of conservation of energy requires that at any given time, the __________ energy should be the ____________. Whenever the total energy in a system increases, it must be due to energy that enters the system from an _______________ source. None of the energy disappears; it just changes __________. To make studying a situation easier, scientists often limit their view to a small area or a small number of objects. These boundaries define a ____________. When the flow of energy into and out of a system is small enough that it can be ignored, the system is called a _____________ system. Most system are __________ systems, which exchange energy with the space that surrounds them. Efficiency of Machines Not all of the work done by a machine is _____________ work. Efficiency is the __________ of useful work out to work in, and is usually expressed as a percentage. Efficiency Equation: Perpetual motion machines (machines designed to go on forever without any input of energy) are _____________________ due to friction and air resistance.