Question

question 9 of 10 which equation correctly relates mechanical energy when there is friction present in a system? a me = e_total - e_thermal b me = e_total - e_thermal c me = e_total + e_thermal d me = e_total / e_thermal

Explanation:

Step1: Recall energy - conservation concept

The total mechanical energy (ME) of a system in the presence of friction is related to the total energy ($E_{total}$) and thermal energy ($E_{thermal}$). The total energy of an isolated system is conserved. When friction is present, some of the total energy is converted into thermal energy. So, the mechanical energy is the total energy minus the thermal energy.

Step2: Identify the correct equation

The correct equation is $ME = E_{total}-E_{thermal}$.

Answer:

B. $ME = E_{total}-E_{thermal}$