2.8: N8) Forces, Energy, and Work — Read

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2.8.1: Forces and Potential Energy
2.8.2: Work Done on a System By All the External Forces
2.8.3: Forces Not Derived From a Potential Energy
2.8.4: Examples
Work-Energy Theorem argues the net work done on a particle equals the change in the particle’s kinetic energy. According to this theorem, when an object slows down, its final kinetic energy is less than its initial kinetic energy, the change in its kinetic energy is negative, and so is the net work done on it. If an object speeds up, the net work done on it is positive.
2.8.E: Work and Kinetic Energy (Exercises)

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