1.7 Work, Power, Mechanical Energy and Heat Transfer
Work, power, kinetic and gravitational potential energy, conduction, convection, radiation, insulation and energy-loss reduction.
How to study for CCEA GCSE Physics
Link every equation to a physical model and unit, interpret graphs and evidence, and prepare each prescribed practical from method through evaluation.
Core concepts
Concept 1
Work is force multiplied by distance moved in the force direction, while power is energy transferred per unit time.
Exam cue: Confirm the CCEA unit, tier and whether the task tests a model, calculation, explanation or practical judgement.
Concept 2
Kinetic energy depends on mass and speed squared; gravitational potential energy depends on mass, field strength and height.
Exam cue: Select the equation from the quantities named, convert mass to kilograms and explain heat transfer using particles, bulk flow or radiation.
Concept 3
Conduction, convection and radiation transfer thermal energy by different mechanisms and require different control strategies.
Exam cue: Show substitutions and units, connect evidence to the physical model and limit the conclusion to the stated conditions.
Risk pitfalls and guardrails
Assuming doubling speed only doubles kinetic energy or describing convection in a solid.
Guardrail: Do not import an England board, Single Award or Double Award structure, and do not replace a causal physical explanation with an equation alone.
Importing an equation sheet, Higher-only boundary or paper convention from an England 9-1 board.
Guardrail: Use the current CCEA formatting to confirm Higher-only content and the correct paper duration; do not infer tier scope from another exam board.
Giving a calculator display or named law without the working, units, causal explanation or evidence the command word requires.
Guardrail: Do not import an England board, Single Award or Double Award structure, and do not replace a causal physical explanation with an equation alone.
Memory anchors
Work
Energy transferred when a force moves an object through a distance.
Power
Energy transferred or work done per unit time.
Kinetic energy
Energy possessed by a moving object, equal to one half mv squared.
Gravitational potential energy
Energy gained through height in a gravitational field, equal to mgh.
Conduction
Thermal transfer through particle interactions and, in metals, free electrons.
Convection
Thermal transfer by bulk motion in a fluid.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
A constant 35 N force moves a box 4.0 m in the force direction. How much work is done?
A machine transfers 7200 J in 30 s. What is its power?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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