PHYS 17200 Lecture 10: Energy Principle
25 Mar 2015
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Phys 17200 - modern mechanics - lecture 10_energy principle. Delta_p(system) = effect (quantity of motion changes); vector. Impulse = effect (impulse is imparted to a system by forces exerted by objects in its surroundings) Delta_e(system) = change in energy of system = effect. W_surroundings = work is done on the system by forces exerted by objects in its surroundings. Q = energy lost as heat ie. delta_e(system) = delta_k + delta_u => k_final + u_final = k_initial + u_initial. Newton"s 3rd law implies that the momentum imparted to a system by interaction with its surroundings is equal in magnitude and opposite in direction to the momentum imparted to the surroundings by its interaction with the system. We will find that the energy imparted to a system by interaction with its surroundings is equal in magnitude and opposite in sign to the energy imparted to the surroundings by its interaction with the system.
