Energy Transfer Questions - GCSE Level
(a) The diagram shows a ski jacket that has been designed to keep a skier warm. The jacket is made from layers of different materials.
(i) The inner layer is shiny to reduce heat transfer. Which process of heat transfer will it reduce? (1 mark)
(ii) Why is the layer of fleece good at reducing the transfer of heat from a skier's body? (1 mark)
(b) A student tested four different types of fleece, J, K, L and M, to find which would make the warmest jacket. Each type of fleece was wrapped around a can which was then filled with hot water. The temperature of the water was taken every two minutes for 20 minutes.
The graph shows the student's results.
(i) In each test, the water cooled faster during the first five minutes than during the last five minutes. Why? (1 mark)
(ii) To be able to compare the results, it was important to use the same volume of water in each test. Give one other quantity that was the same in each test. (1 mark)
(iii) Look at the graph line for fleece K. Estimate what the temperature of the water in the can wrapped in fleece K would be after 40 minutes. (1 mark)
(iv) Which type of fleece, J, K, L or M, should the student recommend to be used in the ski jacket? Give a reason for your answer. (2 marks)
(7 marks total)