ForcesTopic Summary
Knowledge Organiser: Work Done and Energy Transfer
Part of Work Done & Energy Transfer · GCSE GCSE Physics revision
This topic summary covers Knowledge Organiser: Work Done and Energy Transfer within Work Done & Energy Transfer for GCSE Physics. Revise Work Done & Energy Transfer in Forces for GCSE Physics with 13 exam-style questions and 6 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 13 of 13 in this topic. Use this topic summary to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 13 of 13
Practice
13 questions
Recall
6 flashcards
Knowledge Organiser: Work Done and Energy Transfer
Key Terms
- Work done: Energy transferred by a force (J)
- Power: Rate of doing work (W = J/s)
- Joule: 1 J = 1 N × 1 m
- Elastic PE: Energy stored in stretched/compressed material
Key Facts
- Work done = energy transferred
- No movement = no work done
- Force perpendicular to motion = no work done
- Work done against friction → thermal energy
Key Equations
- W = Fs (work done)
- P = W/t (power)
- Ep = ½ke² (elastic PE — higher)
- 1 W = 1 J/s; 1 J = 1 Nm
Exam Tips
- Distance must be in direction of force
- Use weight (N) not mass (kg) for lifting
- Convert time to seconds for power
- Work = energy transfer (mention this in 3+ mark answers)
Common Mistakes
- Using the wrong distance: The distance in W = F × d must be in the direction of the force — if a force is horizontal, use horizontal distance, not total path length
- Using mass instead of weight for lifting: When calculating work done lifting an object, use weight (N) = mass × g — not mass in kg directly
- Saying no work is done when carrying an object horizontally: If you carry an object at constant height with no horizontal motion, no work is done against gravity — work is only done by the horizontal force over horizontal distance
- Confusing work done and power: Work done (J) is the total energy transferred; power (W) is the rate — the same work done more quickly requires more power
- Forgetting to convert time for power: P = W ÷ t requires time in seconds — always convert minutes to seconds before calculating power