AQA Physics Energy Revision Notes
Master AQA Physics Energy using simple revision notes, key facts and practice questions — all generated by AI for your exam.
Energy is the capacity to do work and exists in various forms, including kinetic, potential, thermal, and chemical energy. Understanding energy transfers and transformations is crucial in physics, as it underpins many physical processes and systems.
Key Concepts
- 1Energy cannot be created or destroyed, only transformed (Law of Conservation of Energy).
- 2Kinetic energy is the energy of motion, calculated as KE = 0.5mv².
- 3Potential energy is stored energy based on position or configuration, such as gravitational potential energy (PE = mgh).
- 4Energy transfers occur in processes such as heating, work done, and radiation.
- 5Efficiency is the ratio of useful energy output to total energy input, expressed as a percentage.
Simple Explanation
Energy is what makes things happen. It can be stored, like in a battery, or used immediately, like when you run. There are different types of energy, like kinetic energy when things move and potential energy when things are in a position to move. Energy can change from one type to another, but the total amount stays the same.
Memory Trick
“Remember 'Kinetic and Potential' as 'K&P' to recall the two main types of mechanical energy.”
Flashcards
What is the formula for kinetic energy?
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Exam Questions
Describe and explain the energy transformations that occur when a ball is thrown upwards. [6 marks]
6 marksView mark scheme hint▾
Include initial kinetic energy, conversion to potential energy at the peak, and return to kinetic energy when falling back down.
Explain how energy efficiency can be improved in a system. [4 marks]
4 marksView mark scheme hint▾
Discuss reducing energy losses, using better materials, and optimizing processes.
What is meant by 'conservation of energy'? [2 marks]
2 marksView mark scheme hint▾
State that energy cannot be created or destroyed, only transformed.
Practice Quiz
What is the unit of energy?
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