Physics · May / June 2021 · Paper 61 · Question 4
0625
As printed in the paper
The question as text
A student investigates the rate of cooling, in air, of heated blocks made of different metals. The temperature of each block is increased by placing it in hot water. Plan an experiment to investigate how the rate of cooling depends on the metal from which each block is made. The following apparatus is available to the student: cylindrical blocks of different metals, each with a hole for a thermometer, as shown in Fig. 4.1 a thermometer. Other apparatus normally available in a school laboratory can also be used. In your plan, you should: • list any additional apparatus required • explain briefly how you would carry out the investigation, including the measurements you would take • state the key variables to be kept constant • draw a suitable table, with column headings, to show how you would display your readings (you are not required to enter any readings in the table) • explain how you would use the results to reach a conclusion. hole for thermometer Fig. 4.1
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
MP1
Apparatus: timer
MP2
Remove block from water
MP3
Record temperatures and times
OR record temperatures over a fixed time
OR record time for a fixed temperature drop
MP4
Other block(s) used
MP5
Key variable: One from:
Starting temperature of block
Room temperature
Water temperature
Size of block
Mass of block
MP6
Table with columns for metal / block / material (owtte), temperature OR time OR temperature and time as appropriate to the method. Correct quantity and units required
MP7
Plot graph of temperature against time (for each material)
OR Compare rates of cooling
OR Compare temperature drops (if fixed time used)
OR Compare times (if fixed temperature drop used)
OR Equate large temp. drop / short time to a high rate of cooling (or the converse)
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