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1 (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 energy transfers, the total energy reduces ☐ D when there are no energy transfers, the total energy increases (ii) Give three factors that the student must control in this investigation - Edexcel - GCSE Physics Combined Science - Question 1 - 2022 - Paper 1
Question 1
1 (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 t... show full transcript
Worked Solution & Example Answer:1 (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 energy transfers, the total energy reduces ☐ D when there are no energy transfers, the total energy increases (ii) Give three factors that the student must control in this investigation - Edexcel - GCSE Physics Combined Science - Question 1 - 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 reflects the principle that energy is conserved in a closed system, meaning it can neither be created nor destroyed, only transformed from one form to another.
Step 2
Give three factors that the student must control in this investigation.
Answer
- The mass or volume of water used in the experiment, as this will affect the energy transfer.
- The thickness and material of the insulating materials, as different materials have different insulating properties.
- The starting temperature of the water, which will influence the rate of thermal energy transfer during the experiment.
Step 3
Using the graph in Figure 2, describe how the thermal conductivity of expanded polystyrene changes with the density of expanded polystyrene.
Answer
From the graph in Figure 2, it can be observed that as the density of expanded polystyrene increases, the thermal conductivity decreases. This suggests that denser polystyrene is a better insulator, making it more effective for insulation purposes, as lower thermal conductivity indicates reduced heat transfer.