Mr. Rogers' IB Physics Topics Syllabus 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter IB Objectives Core Thermo HL Thermo Core Energy Core Waves HL Waves HL Digital Tech Opt SL/HL EM Waves Opt SL/HL Com Core Nuclear HL Nuclear Opt HL Relativity Opt HL Medical The above IB topics are not all inclusive but represent those not addressed by the AP Physics C curriculum. Consult the IB syllabus for a complete listing of topics.

DW

Topic 9: HL Thermal Physics (SL optional) - Equations

 1st Law 2nd Law Processes Heat Engines HL Equations
 The equations below were part of those printed in the November 2002 Physics Data Booklet, which is provided with the IB Physics Test. Obviously, if an equation is supplied, there's a good chance it will be used in the test. The equations are provided here as a study aide for the HL IB Physics Test and the Energy option for IB SL Physics to familiarize students with them ahead of time.
Equation Explanation
1) DW = pDV Work ( mechanical energy transfer ): For work to be done by the system, the volume must increase. If the volume decreases, work is being done on the system.
2) DQ = DU + W 1st Law of Thermodynamics: This is a mathematical expression of the law of conservation of energy. Of all the principals in all of science, the 1st law of Thermo is the closest absolute truth. We know of no exceptions.
3)
 +DQ = thermal energy transferred into the system
Heat Transfer: The transfer of thermal energy as opposed to work which is the transfer of mechanical energy.
4)
 +DU = increase in internal energy of the system
Internal Energy: Is increased though positive heat transfer or negative work (work done on the system).
5)
 +DW = work done by the system
Work: Negative work would be work done on the system. Negative work results in a decrease in volume.
6)
 efficiency = Qh - Qc Qh
Thermal Efficiency: The % of heat input into a heat engine which is output as work. This equation is based on the 1st Law of Thermo and assumes no energy storage in the system. Wikipedia Article
7)
 efficiency = W Qh
Thermal Efficiency: While not specifically given in the IB Data Book, in reality this equation is more likely to be used than equation 6 because Qc can be hard to measure. Both equations 6 and 7 are identical in meaning. Work is measured with a dynamometer is measured by knowing the heat of combustion of the heat engine's fuel and its fuel consumption.
8)
 Qh = Qc Th TC
Carnot Cycle: A theoretical thermodynamic cycle for a perfect heat engine.
9)
 efficiency = Th - Tc Th
Carnot Efficiency: The highest possible efficiency a heat engine can achieve assuming no friction. Real heat engines always achieve less than the Carnot efficiency.

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Insultingly Stupid Movie Physics is one of the most humorous, entertaining, and readable physics books available, yet is filled with all kinds of useful content and clear explanations for high school, 1st semester college physics students, and film buffs.

It explains all 3 of Newton's laws, the 1st and 2nd laws of thermodynamics, momentum, energy, gravity, circular motion and a host of other topics all through the lens of Hollywood movies using Star Trek and numerous other films.

If you want to learn how to think physics and have a lot of fun in the process, this is the book for you!

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