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Work/Energy Potential Energy Definition of Potential Energy Examples of Potential Energy Types of Potential Energy 1 Work/Energy Potential Energy Definition of Potential Energy Some types of conservative forces lend themselves to replacing work by what we call potential energy. Potential energy is so called because it measures the potential of a particle to have kinetic energy. Equations for various types of potential energy are always given by the following equation U of a an object for a particular force Wdone by that force on an object The unit of potential energy is the same as that for work. 2 Work/Energy Potential Energy Example with gravity (The system is gravity, the block and the earth) System Δh m Work done by gravity (which is part of the system) h W mgdy mgh 0 3 Potential energy of system U g mgh Work/Energy Potential Energy Example with elastic force (The system is the spring, the block and the thing that the thing to which the other side of the spring attaches) System k x Felastic Work done by gravity (which is part of the system) 1 2 W kxdx k x 0 2 Potential energy of 1 2 system U sp k x 2 x 4 Work/Energy Potential Energy Types of Potential Energy Gravitational Potential Energy U g mgh m1m2 U g G r Elastic Potential Energy 1 2 U sp k x 2 5