AQA GCSE Physics
AQA GCSE Physics 4.1.2.1 Energy Transfers in a System Exam Questions
Free AQA GCSE Physics exam questions for 4.1.2.1 Energy Transfers in a System, with a mark scheme for every pack. Covers conservation of energy, dissipation, wasted energy, reducing unwanted transfers with lubrication and insulation, and thermal conductivity.
4.1.2.1 Energy Transfers in a System exam questions
1 question pack of real past exam questions, each with its mark scheme. Do not stop after a few: answer as many as you can without notes, then mark every answer with the mark scheme. The more questions you do, the more quickly you will spot how examiners ask about each idea.
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About AQA GCSE Physics 4.1.2.1 Energy Transfers in a System
This AQA GCSE Physics section is built around the principle of conservation of energy and the idea that in every real transfer some energy is dissipated, usually to the thermal store of the surroundings. You need to explain how unwanted transfers are reduced, for example by lubrication and thermal insulation, and how thermal conductivity and wall thickness affect the rate of cooling of a building. It is examined on Paper 1. The required practical investigating thermal insulators is physics only. Examiners like 'explain how the energy is wasted' and 'suggest how to reduce it' questions.
What you need to know
- Conservation of energy Energy can be transferred usefully, stored or dissipated, but cannot be created or destroyed. In a closed system there is no net change to the total energy.
- Dissipation In all system changes some energy is dissipated, so it is stored in less useful ways. This energy is often described as wasted, and usually ends up in the thermal store of the surroundings.
- Reducing unwanted transfers Lubrication reduces friction between moving parts, so less energy is dissipated by heating. Thermal insulation reduces the rate of energy transfer by heating.
- Thermal conductivity The higher the thermal conductivity of a material, the higher the rate of energy transfer by conduction across it. Materials with low thermal conductivity are good insulators.
- Rate of cooling of a building The rate of cooling depends on the thickness of its walls and their thermal conductivity. Thicker walls with lower thermal conductivity give a lower rate of cooling. Cavity wall insulation, loft insulation and double glazing all help.
- Required practical (physics only) Investigate the effectiveness of different materials as thermal insulators, and the effect of thickness, by wrapping beakers of hot water and recording the temperature drop over a set time. Control the starting temperature, volume of water and time.
Common mistakes in 4.1.2.1 Energy Transfers in a System
- Writing that energy is 'lost' and disappears. Say it is dissipated (transferred) to the surroundings, usually as thermal energy.
- Saying insulation stops heat transfer. It reduces the rate of energy transfer.
- Mixing up conductivity and insulation. A good insulator has a low thermal conductivity.
- In the insulation practical, not controlling the starting temperature of the water. The rate of cooling depends on the temperature difference with the room, so starting temperatures must be the same.
- Saying lubrication 'removes' friction. It reduces friction, so less work is done against it.
Try three 4.1.2.1 Energy Transfers in a System exam-style questions
1. State the principle of conservation of energy. (1 mark)
Show the mark scheme answer
Energy cannot be created or destroyed, only transferred from one store to another (or usefully, stored or dissipated).
2. Explain how lubricating the moving parts of a machine reduces the energy wasted. (2 marks)
Show the mark scheme answer
Lubrication reduces friction between the moving parts; so less work is done against friction and less energy is dissipated to the thermal store of the parts and surroundings.
3. A student investigates how the thickness of insulation affects the rate of cooling of hot water in a beaker. Describe a method, including the control variables. (4 marks)
Show the mark scheme answer
Wrap beakers in different numbers of layers of the same insulating material; add the same volume of water at the same starting temperature; measure the temperature after the same time (e.g. every minute for 10 minutes) with a thermometer; calculate temperature drop and compare, keeping room temperature, beaker type and lid the same.
4.1.2.1 Energy Transfers in a System FAQs
What does AQA GCSE Physics 4.1.2.1 Energy transfers in a system cover?
It covers conservation of energy, dissipation and wasted energy, ways to reduce unwanted transfers such as lubrication and insulation, and how thermal conductivity affects cooling.
Is the thermal insulation required practical on the combined science course?
No. The thermal insulation required practical is physics only, so it is on the separate AQA GCSE Physics course but not Combined Science Trilogy.
What key words should I use in answers about wasted energy?
Use 'dissipated', 'thermal store of the surroundings', 'rate of energy transfer' and 'thermal conductivity'. Avoid saying energy is lost or used up.
