# Atwood machine conservation of energy equation

The laws and principles of thermodynamics govern the field of Mechanical Engineering. Whenever an engineer wants to design a motor or system they must take into account laws of energy, motion and friction that will effect how the machine works. Learn more about this field, including the basic laws and rules, and how to apply these rules to the development of machines and technologies. Sep 16, 2018 · Answered June 24, 2017 · Author has 53 answers and 20K answer views Eint=Efinal in a closed system is the most basic form of conservation of energy another useful form of the equation is Emechanical +Epotential =E total this can be used to determine the mechanical energy at at any point if the other two are provided. Mar 05, 2009 · The initial energy in the system is just the potential energy of m1 which is: Ei = PE1 = (m1)gh = (5.09 kg)(9.81 m/s^2)(0.791 m) = 39.50 J . Just before m1 hits the ground, the total energy in the system is equal to the kinetic energy in m1 and m2 plus the potential energy in m2 plus the kinetic energy in the pulley.