This is a great activity for lots of levels of science classes. I use it in my pre-ap physics classes, but the questions and data collection are not inappropriate for gifted and talented in elementary school. Students collect data and create graphs for chewing gum speed. They even extrapolate the point at which their jaw will be too tired to keep chewing.
You'll laugh at their data production (chewing at a high rate starts to hurt!) and they'll laugh at each other. Use this at the beginning of the year in your physics classes or at any point where you want to reinforce the purpose of a graph.
Keywords: data, experiment, lab, laboratory, linear, y=mx + b, linear function, decay, extrapolate, independent, dependent, variable, unit, speed, velocity, control, physics, physical science, general science.