Edexcel Physics Energy Revision Notes
Master Edexcel Physics Energy using simple revision notes, key facts and practice questions — all generated by AI for your exam.
Energy is a fundamental concept in physics that describes the ability to do work. It exists in various forms, including kinetic, potential, thermal, and chemical energy, and can be transformed from one form to another.
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 = 1/2 mv².
- 3Potential energy is stored energy based on position, commonly gravitational potential energy, calculated as PE = mgh.
- 4Work done is the transfer of energy, defined as W = Fd cos(θ), where F is force, d is distance, and θ is the angle.
- 5Power is the rate of doing work or transferring energy, calculated as P = W/t.
Simple Explanation
Energy is what makes things happen. It can be in motion (kinetic energy) or stored (potential energy). When you lift something, you give it potential energy, and when it falls, that energy turns into motion. Energy can change forms but the total amount stays the same.
Memory Trick
“Remember 'KPE' for Kinetic, Potential, and Energy – think of a 'Key' that unlocks the different forms of energy.”
Flashcards
What is the formula for kinetic energy?
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Exam Questions
Describe and explain the transformation of energy in a falling object. [6 marks]
6 marksView mark scheme hint▾
Discuss potential energy at height, conversion to kinetic energy as it falls, and energy conservation.
Explain how energy is conserved in a closed system. [4 marks]
4 marksView mark scheme hint▾
Mention energy transformations and the principle of conservation of energy.
What is meant by 'work done'? [2 marks]
2 marksView mark scheme hint▾
Define work done and relate it to force and distance.
Practice Quiz
What is kinetic energy dependent on?
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