Helga notices that heavy balls are often used in demolition work.
She wants to test if heavier balls in fact move things farther when they roll into them. Helga’s rich and lazy, so she asks you to design a controlled experiment to test this. State your hypothesis, how you will collect data and how you will evaluate data.
Hypothesis Controlled variables/manipulated variable Data collection technique Interpretation of data
Invisible Glue How could you test if darkness is really necessary for the glue to stick?