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5 (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 9 to find out which of two materials, sand or sawdust, is the better insulator - Edexcel - GCSE Physics Combined Science - Question 5 - 2022 - Paper 1
Question 5
5 (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 tr... show full transcript
Worked Solution & Example Answer:5 (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 9 to find out which of two materials, sand or sawdust, is the better insulator - Edexcel - GCSE Physics Combined Science - Question 5 - 2022 - Paper 1
Step 1
Which statement describes conservation of energy in a closed system?
Answer
The correct answer is B: when there are energy transfers, the total energy does not change. This statement aligns with the principle of conservation of energy, which asserts that energy cannot be created or destroyed, only transferred or transformed.
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:
- Kettle: Place on a heat source to boil water.
- Thermometer: Insert into the large copper can filled with either sand or sawdust to measure the temperature.
- Stop Clock: Used to time how long it takes for the temperature to change.
- Setup:
- A large copper can containing either sand or sawdust.
- A small copper can inside the large one, filled with water, ensuring the insulation material surrounds the water can.
Labelled Diagram should include:
- Kettle
- Thermometer
- Large copper can (with insulation material)
- Small copper can (with water)
- Stop clock.