Force and Motion Experiment. This fits into the physical science. You could use tin foil, sandpaper, and cardboard to create three different surfaces to see which one has more friction. This could be used in a reading lesson setting.
More Force and Motion Fun -- Marble Races! We discussed velocity and how objects move faster down an inclined plane set at a greater angle. We did a little experiment to prove this using our marble race track! Got the idea HERE.