KINETIC ENERGY STORE — The Energy of Movement
Part of Energy Stores & Systems — GCSE Physics
This key facts covers KINETIC ENERGY STORE — The Energy of Movement within Energy Stores & Systems for GCSE Physics. Revise Energy Stores & Systems in Energy for GCSE Physics with 14 exam-style questions and 30 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 4 of 20 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 4 of 20
Practice
14 questions
Recall
30 flashcards
⚡ KINETIC ENERGY STORE — The Energy of Movement
What it is: The energy stored in any object that is moving. Anything with mass that has velocity has kinetic energy — from a speeding train to a crawling ant, from a spinning planet to vibrating molecules.
The physics behind it: When you push an object to make it move faster, you're doing work on it. This work transfers energy INTO the kinetic store. The energy is "stored" in the motion itself — the object can do work on other things by colliding with them or pushing them.
Why it depends on v²: Kinetic energy is proportional to velocity SQUARED. This means:
- Double the speed → 4× the kinetic energy (2² = 4)
- Triple the speed → 9× the kinetic energy (3² = 9)
- This is why speeding is so dangerous — a car at 60mph has FOUR TIMES the crash energy of one at 30mph
Real-world examples:
- A moving car — KE increases dramatically with speed
- Wind — moving air molecules; harnessed by wind turbines
- Flowing water — rivers, waterfalls; powers hydroelectric dams
- A kicked football — chemical energy from muscles → KE of ball
- Sound waves — particles vibrating back and forth have KE
💡 Exam tip: When asked "where does the kinetic energy go when something stops?" — it almost always transfers to the THERMAL store of the surroundings (friction makes things warm up). Brakes get hot, tyres get hot, the road gets slightly warmer.