Describe how thermal energy can be lost from a system Explain how to calculate the efficiency of a heat engine
Research how a steam turbine works and the energy transfers involved
Try your best to answer the RAG’ed questions below.
KS5 Homework focus: Unit 5: Calculating Efficiency
State the changes of state that can occur and describe what is meant by a ‘two-phase’ system
Explain what the critical point is, using water as an example
Explain how to calculate specific latent heat
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KS5 Homework focus: Unit 5: Changes of State
State the law of conservation of energy and describe Newton’s First Law
Explain what is meant by ‘useful’ and ‘wasted’ energy and choose an example of a system and identify the two
Research the five types of energy (mechanical, electrical, chemical, nuclear and thermal) and give examples of each
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KS5 Homework focus: Unit 5: Conservation of Energy
Give examples of, and describe the properties of Non-Newtonian fluids
Explain Bernoulli’s principle
Explain how aircraft wings are designed and how they use Bernoulli’s principle
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KS5 Homework focus: Unit 5: Fluids in Motion
Explain what is meant by ‘thermal equilibrium’Explain the energy transfer in two objects at thermal equilibrium
Research how thermometers work to give an accurate reading of temperature
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KS5 Homework focus: Unit 5: Heat and Temperature
Explain how vapour compression refrigerators and heat pumps
Compare how a steam turbine engine works with how internal combustion engines work
Research into the theoretical coefficient performance (CoP) of a refrigerator and explain how to maximise CoP
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KS5 Homework focus: Unit 5: Heat Engines, Refrigerators and Heat Pumps
State the four processes for a working fluid and state the formula for calculating the efficiency of an ideal Carnot cycle engine
Explain what is meant by ‘maximum theoretical efficiency’
Research how Carnot’s research lead to our current understanding of ideal engine cycles
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KS5 Homework focus: Unit 5: Ideal Engine Cycles
Describe the three properties of an ideal gas and state the equation of state for an ideal gas
Explain how to calculate the work done by gas escaping a balloon
Write an exam question and mark scheme for a question about ideal gases
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KS5 Homework focus: Unit 5: Ideal Gas Equation
State what is meant by ‘internal energy’ and the symbol for it and state the equation linked to the first law of thermodyanmics
Explain why, in the equation, Q has a positive sign and W has a negative sign
Research the internal energy stored in an object of your choice
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KS5 Homework focus: Unit 5: Internal Energy and the First Law of Thermodynamics
Describe what happens when something reaches its elastic limit Explain how creep and fatigue can effect a material
Research how elastomers are made and their uses
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KS5 Homework focus: Unit 5: Materials in Domestic and Industrial Applications
Describe what the second law of thermodynamics is used for Explain what is meant by ‘entropy’
Choose a natural process and link it to the second law of thermodynamics
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KS5 Homework focus: Unit 5: Natural Processes and the Second Law of Thermodynamics
Describe what is meant by an ‘isothermal process’ and an ‘adiabatic process’
Explain the difference between an isothermal process and an adiabatic process
Choose a ‘reversible’ process and explain why it can never fully be achieved
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KS5 Homework focus: Unit 5: Reversible Processes
Describe what is meant by ‘work done’ Explain the difference between ‘positive’ work done and ‘negative’ work done
Explain how to calculate work done by a gas and why you don’t have to consider direction when calculating it
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KS5 Homework focus: Unit 5: Work Done
