# 8 - 8.1. Conservation laws In this chapter we will discuss...

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8.1. Conservation laws In this chapter we will discuss conservation of energy. The conservation laws in physics can be expressed in very simple form: " Consider a system of particles, completely isolated from outside influence. As the particles move about and interact with each other, there are certain properties of the system that do not change " In short we can express this as X = constant in which X is the conserved property. 8.2. Conservation of mechanical energy A mass hanging from the ceiling will have a kinetic energy equal to zero. If the cord breaks, the mass will rapidly increase its kinetic energy. This kinetic energy was somehow stored in the mass when it was hanging from the ceiling: the energy was hidden, but has the potential to reappear as kinetic energy. The stored energy is called potential energy . Conservation of energy tells us that the total energy of the system is conserved , and in this case, the sum of kinetic and potential energy must be constant. This means that

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8 - 8.1. Conservation laws In this chapter we will discuss...

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