This simple lab should produce more precise results than yesterday's lab. Let a marble roll down the ramp and then along the table, and off the edge of the table. Then carefully measure how far from the edge of the table the marble first hits the floor. Does this tell you the speed of the marble while it rolls along the table? Record how far along the ramp the marble rolls, as well as how far above the table the marble is when it begins rolling. Be sure to use at least two different inclines for the ramp. Consider all our thoughts about graphing, and see if you can produce a graph of your data that reveals the nature of the relationship between speed and kinetic energy. Maybe there's more than one graph in there, waiting to come out.

It would be good to use different sizes of marbles, and to see if size matters. If it does, why does it matter?

Also measure the amount of time it takes a marble to roll down the ramp starting from various points along the ramp; for this it would be good to use the ramp at a fairly shallow angle. Are you witnessing linear acceleration?