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If a potential energy can be associated with a force, we call the force conservative. Examples of conservative forces are the spring force and the gravitational force. If a potential energy can not be associated with a force, we call that force non-conservative. An example is the friction force.
External forces are also known as nonconservative forces. Kinetic energy is the energy caused by the movement of the system, and potential energy is the energy the system can use. The total energy of the system is the sum of the two.