1What is a variable? Give one example.
2Using the example of a wilted plant, tell the cause apart from the effect.
3Why is it not enough just to know the cause and the effect?
4What are the variables in the catapult experiment? Which two of them were kept the same this time?
5What does \( x \propto e \) mean? What happens to \( x \) if \( e \) is made three times as large?
6What is the task of a scientist?
7What is empirical evidence, and why does scientific study depend on it?
8Why is the paper bullet called a projectile?