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The main energy stores at GCSE are kinetic, thermal, chemical, gravitational potential, elastic potential, magnetic, electrostatic and nuclear. Free notes.
Energy Stores & Systems: Introduction is part of Energy changes in a system, and the ways energy is stored before and after such changes in GCSE AQA Higher Physics.
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The main energy stores at GCSE are kinetic, thermal, chemical, gravitational potential, elastic potential, magnetic, electrostatic and nuclear. Free notes.
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Use this lesson to stay inside Energy changes in a system, and the ways energy is stored before and after such changes while connecting the detail back to the wider Energy topic.
Read the core explanations from Energy Stores & Systems: Introduction before testing yourself from memory.
Picture a bouncing ball. You could study just the ball, or the ball plus the Earth, or even include the air around it. Each choice gives you a different system - the collection of objects you've decided to focus on.
The clever bit is choosing your system boundary wisely. If you're studying a car crash, your system might include both cars. If you're looking at a kettle boiling water, your system could be just the water, or the water plus the kettle, or even include the heating element.
Energy does not just float around - it is always stored somewhere. At GCSE you should know the main stores, including kinetic, thermal, chemical, gravitational potential, elastic potential, magnetic, electrostatic and nuclear stores. Thinking in terms of stores helps you explain where energy is at the start of a process and where it ends up after transfer.
Kinetic energy store: Moving objects have energy in this store. The faster they move, the more energy is stored here. A speeding car has much more kinetic energy than a walking person.
Gravitational potential energy store: Objects lifted up against gravity store energy here. A book on a high shelf has more gravitational potential energy than one on the floor.
Elastic potential energy store: Stretched or compressed objects store energy here. A stretched rubber band or compressed spring both have elastic potential energy.
Chemical energy store: Food, fuels, and batteries store energy in chemical bonds. When these bonds break or form, energy is released or absorbed.
Thermal energy store: Hot objects store energy as the random motion of their particles. The hotter something is, the more thermal energy it contains.
Here's where it gets interesting. When a system changes, energy doesn't disappear - it moves between different stores. This is like transferring money between bank accounts; the total amount stays the same, but the distribution changes.
Worked example: Analysing Energy Changes: Falling Ball
A 0.5 kg ball is dropped from a height of 10 m. Describe the energy changes as it falls.
Answer: Energy transfers from gravitational potential energy store to kinetic energy store, with total energy conserved at 49 J.
The key insight is that energy is conserved - the total amount never changes, only the distribution between stores. This is one of the most fundamental laws in physics.
Let's look at some everyday examples where you can spot energy transfers happening. These are the types of situations that appear in exams, so understanding the patterns will help you tackle any scenario.
Stretching a spring: You do work (transfer energy) to the spring. Energy goes into the elastic potential energy store. When released, this energy transfers to the kinetic energy store of whatever the spring pushes.
Heating water in a kettle: Electrical energy transfers to the thermal energy store of the water. The water temperature rises as more energy is added to its thermal store.
Car braking: The kinetic energy store of the car decreases. This energy transfers to the thermal energy stores of the brakes and surroundings through friction. The brakes get hot.
Notice the pattern: something changes in the system (position, shape, temperature, motion), and energy moves between stores to make this change happen. The total energy stays constant, but its distribution shifts.
Energy questions in exams follow predictable patterns. Master these techniques and you'll spot the marks easily.
Watch out for the common trap: many students say energy 'changes into' other types. Energy doesn't change - it transfers between stores. The energy itself stays as energy, but moves location.
A magnetic store is important whenever magnets attract or repel, or when magnetic fields are involved in devices such as motors, speakers and relays. This store is part of the AQA energy-stores model, so it should be listed alongside the other stores rather than left out. Using the correct store language helps you earn marks in extended explanations.
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Move to the related lessons or back to the topic page when you need the wider sequence before exam-style practice.
The main energy stores at GCSE are kinetic, thermal, chemical, gravitational potential, elastic potential, magnetic, electrostatic and nuclear. Thinking in terms of stores helps explain where energy is at the start of a process and where it ends up after transfer.
An energy store is where energy is held in an object or system, because energy is always stored somewhere. For example, moving objects have energy in their kinetic energy store, and food, fuels and batteries hold energy in their chemical energy store.
The thermal energy store is energy held by hot objects as the random motion of their particles; the hotter something is, the more thermal energy it contains. Heating water in a kettle transfers electrical energy to the thermal energy store of the water, so its temperature rises.
A system is an object or group of objects that we choose to study when analysing energy changes. For a kettle boiling water, the system could be just the water, the water plus the kettle, or even include the heating element.
The types of energy stores are kinetic (moving objects), gravitational potential (objects lifted against gravity), elastic potential (stretched or compressed objects), chemical (food, fuels and batteries), thermal (hot objects), magnetic, electrostatic and nuclear.
The main stores of energy are kinetic, thermal, chemical, gravitational potential, elastic potential, magnetic, electrostatic and nuclear. Thinking in terms of stores helps explain where energy is at the start of a process and where it ends up after a transfer.
The main energy stores are kinetic, thermal, chemical, gravitational potential, elastic potential, magnetic, electrostatic and nuclear. The magnetic store should be listed alongside the others; it is important whenever magnets attract or repel, or in devices such as motors, speakers and relays.
The magnetic energy store is the store involved whenever magnets attract or repel, or when magnetic fields are involved in devices such as motors, speakers and relays. It is one of the main energy stores and should be listed alongside the others.
A system is an object or group of objects chosen to study when analysing energy changes, and energy stores are where that energy is held, such as kinetic, thermal or chemical. When a system changes, energy moves between stores, but the total amount stays the same.
When a ball is dropped, energy transfers from the gravitational potential energy store to the kinetic energy store. A 0.5 kg ball dropped from 10 m starts with 0.5 × 9.8 × 10 = 49 J of gravitational potential energy, and just before impact has 49 J of kinetic energy, so the total is conserved.
Energy does not 'change into' other types; it transfers between stores. When a system changes, energy moves between different stores, like transferring money between bank accounts, so the total amount stays the same while the distribution changes.
Compressing a spring transfers energy into the spring's elastic potential energy store, not out to the surroundings. Work is done on the spring, and when the spring is released this energy transfers to the kinetic energy store of whatever the spring pushes.
The different stores of energy include kinetic, as in a speeding car, gravitational potential, as in a book on a high shelf, elastic potential, as in a stretched rubber band, chemical, as in food, fuels and batteries, and thermal, as in hot objects. Magnetic, electrostatic and nuclear stores are also on the list.