Microgravity exists within a free falling object. Prep Download and print the activity. Discuss the scientific method and the need to control variables. When kids are writing upside down, roller balls and felt-tip pens may last a long time, resulting in tired arms. If different groups test different types of pens, you could compile a large student graph at the end.
Procedure Have students pair up.
Or you could divide them into groups of two or three. Distribute the student article, activity and data sheet. Have students read the student article. Go over the activity sheet. To make a meaningful scientific test, one of these variables has to be controlled, or kept constant.