Physics · Paper 1
Energy
Energy stores and systems, kinetic, elastic and gravitational potential energy, specific heat capacity, power, conservation and dissipation, efficiency, and national and global energy resources.
Lessons
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1
Energy stores and systems
Describe the changes in the way energy is stored when a system changes, using energy stores and transfer pathways.
6 terms -
2
Kinetic, elastic and gravitational potential energy
Calculate the energy in a moving object, a stretched spring and an object raised above the ground, using E_k = ½mv², E_e = ½ke² and E_p = mgh.
6 terms -
3
Specific heat capacity
Use ΔE = mcΔθ to calculate energy changes when a temperature changes, and describe how to determine the specific heat capacity of a material (Required…
6 terms -
4
Power
Define power as the rate of transfer of energy or of doing work, and use P = E ÷ t and P = W ÷ t.
6 terms -
6
Efficiency
Calculate efficiency as a decimal or a percentage using energy or power, interpret Sankey diagrams, and describe ways to increase efficiency (Higher tier).
6 terms -
7
National and global energy resources
Describe the main energy resources, distinguish renewable from non-renewable, compare their uses and reliability, and evaluate their environmental impact.
6 terms -
5
Energy transfers, conservation and dissipation
Describe how energy is conserved but dissipated, explain ways of reducing unwanted energy transfers, and investigate thermal insulators (Required Practical 2…
6 terms
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- Energy stores and systems.pptx Built from the lesson script on 30 September 2026. View
- Energy stores and systems - Completed Notes.docx The full notes for the lesson, to revise from. Built from the lesson script on 30 September 2026. View
- Energy stores and systems - Exam Questions.docx Built from the lesson script on 30 September 2026. View
- Kinetic elastic and gravitational potential energy.pptx Built from the lesson script on 30 September 2026. View
- Kinetic elastic and gravitational potential energy - Completed Notes.docx The full notes for the lesson, to revise from. Built from the lesson script on 30 September 2026. View
- Kinetic elastic and gravitational potential energy - Exam Questions.docx Built from the lesson script on 30 September 2026. View
- Specific heat capacity.pptx Built from the lesson script on 30 September 2026. View
- Specific heat capacity - Completed Notes.docx The full notes for the lesson, to revise from. Built from the lesson script on 30 September 2026. View
- Specific heat capacity - Exam Questions.docx Built from the lesson script on 30 September 2026. View
- Power.pptx Built from the lesson script on 30 September 2026. View
- Power - Completed Notes.docx The full notes for the lesson, to revise from. Built from the lesson script on 30 September 2026. View
- Power - Exam Questions.docx Built from the lesson script on 30 September 2026. View
- Efficiency.pptx Built from the lesson script on 30 September 2026. View
- Efficiency - Completed Notes.docx The full notes for the lesson, to revise from. Built from the lesson script on 30 September 2026. View
- Efficiency - Exam Questions.docx Built from the lesson script on 30 September 2026. View
- National and global energy resources.pptx Built from the lesson script on 30 September 2026. View
- National and global energy resources - Completed Notes.docx The full notes for the lesson, to revise from. Built from the lesson script on 30 September 2026. View
- National and global energy resources - Exam Questions.docx Built from the lesson script on 30 September 2026. View
- Energy transfers conservation and dissipation.pptx Built from the lesson script on 30 September 2026. View
- Energy transfers conservation and dissipation - Completed Notes.docx The full notes for the lesson, to revise from. Built from the lesson script on 30 September 2026. View
- Energy transfers conservation and dissipation - Exam Questions.docx Built from the lesson script on 30 September 2026. View
Key terms in this chapter
All 42, gathered from every lesson.
- System
- An object or group of objects.
- Energy store
- A way energy is held, such as kinetic or thermal.
- Transfer
- Energy moving from one store to another.
- Dissipated
- Spread out to the surroundings in less useful stores.
- Closed system
- A system where no energy enters or leaves.
- Work done
- Energy transferred by a force or a current.
- Kinetic energy
- Energy stored in the movement of an object.
- Elastic potential energy
- Energy stored in a stretched or compressed object.
- Gravitational potential energy
- Energy stored in an object raised above the ground.
- Spring constant
- How stiff a spring is; force needed per metre of extension.
- Extension
- The increase in length of a spring.
- Gravitational field strength
- The force on each kilogram; 9.8 N/kg on Earth.
- Specific heat capacity
- Energy needed to raise 1 kg of a substance by 1 °C.
- Thermal energy
- Energy stored in the moving particles of a substance.
- Temperature change
- Final temperature minus starting temperature, \(\Delta\theta\).
- Insulation
- A material that reduces energy transfer by heating.
- Joulemeter
- A meter that shows the energy transferred in joules.
- Gradient
- How steep a graph line is.
- Power
- The rate at which energy is transferred or work is done.
- Watt
- The unit of power; one joule per second.
- Work done
- Energy transferred by a force moving an object.
- Rate
- How much something changes in each unit of time.
- Kilowatt
- 1000 watts.
- Energy transferred
- The amount of energy moved from one store to another.
- Efficiency
- The fraction of the input energy that is transferred usefully.
- Useful output
- Energy transferred in the way that is wanted.
- Wasted energy
- Energy transferred to stores that are not useful.
- Sankey diagram
- A diagram with arrow widths that show energy amounts.
- Streamlining
- Shaping an object to reduce air resistance.
- Input
- The energy or power supplied to a device.
- Renewable
- A resource that is replenished as it is used.
- Non-renewable
- A resource that will run out.
- Fossil fuel
- Coal, oil or natural gas formed from ancient organisms.
- Reliable
- Able to supply energy whenever it is needed.
- Bio-fuel
- A fuel made from plant or animal matter.
- Global warming
- Rise in the Earth's average temperature linked to greenhouse gases.
- Dissipated
- Transferred to the surroundings and stored in less useful ways.
- Thermal conductivity
- How well a material conducts thermal energy.
- Insulator
- A material with low thermal conductivity.
- Lubrication
- Using oil or grease to reduce friction.
- Closed system
- A system where no energy enters or leaves.
- Control variable
- A variable kept the same in a fair test.