Internal Energy Quiz with Answers: AP Physics 2 Review

📚 Quick Study Guide

• 🔥 Internal Energy (U): The total energy contained within a thermodynamic system. It excludes kinetic or potential energy of the system as a whole.
• 🌡️ Temperature: A measure of the average kinetic energy of the particles in a system. Changes in internal energy often correspond to changes in temperature.
• ⚙️ Work (W): Energy transferred when a force causes a displacement. In thermodynamics, work done *by* the system is positive, and work done *on* the system is negative.
• heat Heat (Q): Energy transferred due to a temperature difference. Heat added *to* the system is positive, and heat removed *from* the system is negative.
• ⚖️ First Law of Thermodynamics: $\Delta U = Q - W$, where $\Delta U$ is the change in internal energy, $Q$ is the heat added to the system, and $W$ is the work done by the system.
• 🔄 Adiabatic Process: A process where no heat is exchanged with the surroundings ($Q = 0$). Thus, $\Delta U = -W$.
• 🌡️ Isobaric Process: A process occurring at constant pressure. The work done is $W = P\Delta V$.
• 💧 Isochoric Process: A process occurring at constant volume. Since $\Delta V = 0$, no work is done ($W = 0$), and $\Delta U = Q$.
• ♨️ Isothermal Process: A process occurring at constant temperature. For an ideal gas, $\Delta U = 0$, and $Q = W$.

🧪 Practice Quiz

1. Question 1: What does the First Law of Thermodynamics state?
   1. A) The total energy of an isolated system is constant.
   2. B) Energy can neither be created nor destroyed.
   3. C) $\Delta U = Q - W$
   4. D) All of the above.
2. Question 2: In an adiabatic process, what quantity is equal to zero?
   1. A) Work (W)
   2. B) Change in Internal Energy ($\Delta U$)
   3. C) Heat (Q)
   4. D) Temperature (T)
3. Question 3: During an isobaric process, which of the following remains constant?
   1. A) Volume
   2. B) Pressure
   3. C) Temperature
   4. D) Internal Energy
4. Question 4: In an isochoric process, what is the value of work done (W)?
   1. A) W = P$\Delta$V
   2. B) W > 0
   3. C) W < 0
   4. D) W = 0
5. Question 5: For an ideal gas undergoing an isothermal process, what is the change in internal energy ($\Delta U$)?
   1. A) $\Delta U > 0$
   2. B) $\Delta U < 0$
   3. C) $\Delta U = 0$
   4. D) $\Delta U = Q$
6. Question 6: If heat is added to a system, what is the sign convention for Q in the First Law of Thermodynamics?
   1. A) Positive
   2. B) Negative
   3. C) Zero
   4. D) Depends on the work done
7. Question 7: Which process involves no change in temperature?
   1. A) Adiabatic
   2. B) Isobaric
   3. C) Isochoric
   4. D) Isothermal