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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 tran... 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 energy conservation, indicating that energy is neither created nor destroyed, only transformed from one form to another.
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 investigate which material is the better insulator, the diagram should include the following elements:
- Kettle: To heat water. The kettle should be positioned so that it can supply boiling water to the experiment.
- Thermometer: This should be placed in the large copper can to measure the temperature of the water.
- Large Copper Can: Filled with boiling water and surrounded by either sand or sawdust, which will be in the smaller copper can.
- Small Copper Can: This should hold the insulator (sand or sawdust) and be nested in the large copper can, allowing for the measurement of temperature loss over time.
- Stop Clock: To monitor the time interval for the temperature change measurement.
Ensure that all components are clearly labelled in the diagram.