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8 (a) Which statement describes conservation of energy in a closed system? A When there are energy transfers, the total energy reduces B When there are energy transfers, the total energy does not change C When there are no energy transfers, the total energy reduces D When there are no energy transfers, the total energy increases (b) A student uses the apparatus in Figure 12 to find out which of two materials, sand or sawdust, is the better insulator - Edexcel - GCSE Physics - Question 8 - 2022 - Paper 1
Question 8
8 (a) Which statement describes conservation of energy in a closed system? A When there are energy transfers, the total energy reduces B When there are energy tran... show full transcript
Worked Solution & Example Answer:8 (a) Which statement describes conservation of energy in a closed system? A When there are energy transfers, the total energy reduces B When there are energy transfers, the total energy does not change C When there are no energy transfers, the total energy reduces D When there are no energy transfers, the total energy increases (b) A student uses the apparatus in Figure 12 to find out which of two materials, sand or sawdust, is the better insulator - Edexcel - GCSE Physics - Question 8 - 2022 - Paper 1
Step 1
Which statement describes conservation of energy in a closed system?
Answer
The correct statement is B: When there are energy transfers, the total energy does not change. This is because, in a closed system, energy can be transformed from one form to another, but the total amount of energy remains constant.
Step 2
Draw a labelled diagram to show how the student should set up the equipment to investigate which material is the better insulator.
Answer
To set up the experiment:
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Apparatus Arrangement: Draw a kettle connected to a power source to boil water, ensuring it has a thermometer inserted to measure the temperature of the water accurately.
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Insulating Materials: Show two containers, one with sand and the other with sawdust, placed next to each other to compare their insulating abilities. Label each container appropriately.
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Measurement Tools: Include the stop clock prominently, indicating that it will be used to measure the time taken for the temperature change.
Make sure to label the thermometer, kettle, and insulating materials clearly in the diagram.