Work, Energy & Power — A-Level Physics Revision
Revise Work, Energy & Power for A-Level Physics. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to MomentumWhat is Work, Energy & Power?
This topic connects the concepts of force and motion with energy. Work is defined as the energy transferred when a force causes displacement, and power is the rate at which work is done or energy is transferred. You will learn to calculate work done, kinetic energy, and gravitational potential energy, and apply the fundamental principle of conservation of energy to solve problems involving energy transformations.
Board notes: A core mechanics topic for all A-Level boards (AQA, Edexcel, OCR). All boards expect proficiency in calculations involving work, kinetic energy, potential energy, and power. The application of the conservation of energy principle in various contexts, including those with resistive forces, is a common examination focus.
Step-by-step explanationWorked example
A 60 kg person runs up a flight of stairs with a vertical height of 5.0 m in 4.0 s. To find their average power output, first calculate the work done against gravity (gain in GPE): Work = mgh = 60 kg * 9.81 m/s² * 5.0 m = 2943 J. Now, calculate the power: Power = Work / time = 2943 J / 4.0 s = 735.75 W. Their average power output is approximately 736 W.
Mini lesson for Work, Energy & Power
1. Understand the core idea
This topic connects the concepts of force and motion with energy. Work is defined as the energy transferred when a force causes displacement, and power is the rate at which work is done or energy is transferred.
Can you explain Work, Energy & Power without copying the notes?
2. Turn it into marks
A 60 kg person runs up a flight of stairs with a vertical height of 5.
Underline the method, evidence, or command-word move that would earn credit in A-Level Paper 1 — Particles, Waves & Electricity.
3. Fix the likely mark leak
Watch for this mistake: Forgetting that the displacement in the work done equation (W = Fx cosθ) must be in the direction of the force. If the force and displacement are perpendicular, no work is done.
Write one correction rule before doing another practice question.
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Work, Energy & Power practice questions
These are original StudyVector questions for revision practice. They are not official exam-board questions.
Question 1
In one A-Level sentence, explain what Work, Energy & Power is testing.
Answer: This topic connects the concepts of force and motion with energy. Work is defined as the energy transferred when a force causes displacement, and power is the rate at which work is done or energy is transferred.
Mark focus: Precise definition and topic focus.
Question 2
A Work, Energy & Power question uses an unfamiliar context. What should the answer do before adding detail?
Answer: It should name the process, variable, equation, particle model, or evidence being tested, then explain the result using precise scientific vocabulary.
Mark focus: Method selection and command-word control.
Question 3
A student makes this mistake: "Forgetting that the displacement in the work done equation (W = Fx cosθ) must be in the direction of the force. If the force and displacement are perpendicular, no work is done." What should their next repair task be?
Answer: Do one Work, Energy & Power question and review the mistake type.
Mark focus: Error correction and next-step practice.
Work, Energy & Power flashcards
Core idea
What is the main idea in Work, Energy & Power?
This topic connects the concepts of force and motion with energy. Work is defined as the energy transferred when a force causes displacement, and power is the rate at which work is done or energy is transferred.
Common mistake
What mistake should you avoid in Work, Energy & Power?
Forgetting that the displacement in the work done equation (W = Fx cosθ) must be in the direction of the force. If the force and displacement are perpendicular, no work is done.
Practice
What is one useful practice task for Work, Energy & Power?
Answer one Work, Energy & Power question and review the mistake type.
Exam board
How should you use board notes for Work, Energy & Power?
A core mechanics topic for all A-Level boards (AQA, Edexcel, OCR). All boards expect proficiency in calculations involving work, kinetic energy, potential energy, and power.
Common mistakes
- 1Forgetting that the displacement in the work done equation (W = Fx cosθ) must be in the direction of the force. If the force and displacement are perpendicular, no work is done.
- 2Confusing the principle of conservation of energy with the conservation of mechanical energy. Total energy is always conserved, but mechanical energy (KE + PE) is only conserved in the absence of non-conservative forces like friction or air resistance.
- 3Using inconsistent units in calculations, for example, using mass in grams instead of kilograms, or time in minutes instead of seconds when calculating power.
Work, Energy & Power exam questions
Exam-style questions for Work, Energy & Power with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Work, Energy & Power
Core concept
This topic connects the concepts of force and motion with energy. Work is defined as the energy transferred when a force causes displacement, and power is the rate at which work is done or energy is t…
Frequently asked questions
What is the work-energy principle?
The work-energy principle states that the net work done on an object is equal to the change in its kinetic energy. This provides a direct link between the forces acting on an object and its change in speed.
What is efficiency in the context of energy and power?
Efficiency is a measure of how effectively energy is transferred or converted. It is calculated as the ratio of useful energy (or power) output to the total energy (or power) input, often expressed as a percentage.