Objects A and B interact with each other via both conservative and nonconservative forces. Let K_A and K_B be the kinetic energies, U be the potential energy, and E_int be the internal energy. If no external agent does work on the objects then: A) K_A + U is conserved B) K_A + U + E_int is conserved C) K_A + K_B + E_int is conserved D) K_A + K_B + U is conserved E) K_A + K_B + U + E_int is conserved

Question

Quizplus · Accepted Answer

In a system where both conservative and nonconservative forces are present, the total mechanical energy (kinetic plus potential) is not conserved due to the work done by nonconservative forces. However, if no external work is done on the system, the total energy, which includes kinetic energy, potential energy, and internal energy (accounting for the energy "lost" to nonconservative forces), remains conserved. This is why the sum of kinetic energies of objects A and B, the potential energy, and the internal energy is conserved.

Objects a and B Interact with Each Other Via Both