Students identify the variables to be kept constant, and the variable to be different, when they plan a fair test to show if green plants need light to grow.
Students read some information about testing the absorbency of different papers. They outline two features that need to be kept the same if the tests were to be fair.
Students are required to write down some relevant questions about the Moon's surface that they would ask an astronaut who has just returned to the Earth from the Moon.
Task: Select which stirrer would feel hottest and explain why, and in which container soup would cool fastest, and explain why. Assessment focus: heat conduction.