AP Physics 2 first law of thermodynamics study guide
This study guide covers the first law of thermodynamics, including key concepts, equations, and real-world applications relevant for AP Physics 2 exam preparation.
Quiz(24 vragen)
1. What does the first law of thermodynamics state?
Termen in deze set(24)
Basic Concepts(12)
What is the first law of thermodynamics?
The first law states that energy cannot be created or destroyed, only transformed. Mathematically: ΔU = Q - W.
Define internal energy (U).
Internal energy is the total energy contained within a system, including kinetic and potential energy of molecules.
True or False: Work done on a system increases its internal energy.
True. Work done on a system increases its internal energy, as per ΔU = Q - W.
Identify two types of work in thermodynamics.
- Mechanical work - Boundary work (P-V work)
What does Q represent in the first law?
Q represents the heat added to the system. If heat is lost, Q is negative.
Fill in the blank: ΔU = ____ - W.
ΔU = Q - W.
Comparison: Isothermal vs. adiabatic processes.
Isothermal: constant temperature, heat exchanged. Adiabatic: no heat exchanged, changes in temperature.
Cause → Effect: Adding heat to a gas.
Adding heat increases the internal energy and can increase temperature or do work.
Calculate work done: 100 J of heat added, 40 J of work done by the system.
ΔU = Q - W = 100 J - 40 J = 60 J.
What is an isolated system?
An isolated system does not exchange heat or work with its surroundings, maintaining constant internal energy.
True or False: Energy losses in thermodynamic processes are always due to friction.
False. Energy losses can occur due to heat transfer or work done against external forces, not just friction.
Define heat (Q) in thermodynamic terms.
Heat is the transfer of thermal energy between systems due to temperature difference.
Applications and Examples(12)
Heating water in a kettle: what happens?
Energy is transferred to the water, increasing its internal energy, raising the temperature.
True or False: The first law states energy cannot be created or destroyed.
True. The first law of thermodynamics states energy is conserved.
Fill in the blank: In an ideal gas, internal energy depends only on ______.
temperature.
Comparison: Isothermal vs. Adiabatic processes.
- Isothermal: constant temperature, heat exchange. - Adiabatic: no heat exchange, temperature changes.
A steam engine converts heat into work. What law applies?
The first law of thermodynamics applies as it transforms thermal energy into mechanical energy.
Calculate work done: . If P = 2 atm, ΔV = 5 L.
Convert: 1 atm = 101.3 kPa. Work, W = 2 atm * 5 L = 10 L·atm = 101.3 kPa * 0.005 m³ = 0.5065 kJ.
True or False: Heat added to a system always increases its temperature.
False. Heat can change phase without changing temperature (e.g., melting ice).
What happens in a refrigerator regarding the first law?
Heat is removed from the inside, doing work on the refrigerant, keeping the interior cold.
Cause: Burning gasoline in a car engine.
Effect: Chemical energy converts to thermal energy, then to mechanical work.
What is the significance of a heat engine’s efficiency?
Efficiency measures how much work is produced from heat energy. Efficiency = Work Output / Heat Input.
What happens when ice melts at 0°F?
Energy is absorbed for the phase change, even though temperature remains constant (latent heat).
Question: How does insulation affect energy transfer?
Insulation reduces heat loss, conserving energy within a system according to the first law.
Vragen in deze set(24)
1. What does the first law of thermodynamics state?
2. What is the primary focus of the first law of thermodynamics?
3. Which of the following best defines internal energy (U)?
4. In an adiabatic process, what happens to the temperature of a gas when it expands?
5. True or False: Work done on a system decreases its internal energy.
6. Which scenario best illustrates the first law of thermodynamics?
7. Which of the following is a type of work in thermodynamics?
8. What does the efficiency of a heat engine represent?
9. What does the symbol Q represent in the first law of thermodynamics?
10. Which of the following processes is isothermal?
11. Fill in the blank: ΔU = ____ - W.
12. True or False: Heat added to a system always results in a temperature increase.
13. In an isothermal process, what remains constant?
14. What happens to the internal energy of a system when heat is added and work is done by the system?
15. What happens to a gas when heat is added to it?
16. Which of the following statements is NOT true about thermal energy transfer?
17. If 200 J of heat is added and 50 J of work is done by the system, what is ΔU?
18. In the context of the first law, what is latent heat?
19. What characterizes an isolated system?
20. If a system absorbs 500 J of heat and does 200 J of work, what is the change in internal energy?
21. True or False: Energy losses in thermodynamic processes are exclusively due to friction.
22. What effect does insulation have on a thermodynamic system?
23. Which of the following best defines heat (Q) in thermodynamics?
24. When a substance is heated to its boiling point, what happens to its temperature?
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