Rubber bands around outside for traction, and a small ramp to race the two on. The beads inside one bottle are heavier than the liquid and take more energy to get moving. Therefore the bottle with the beads always looses the race. Bottle has rubber band stretched from cap to bottom with hanging bolt at mid-point for mass. Rubber bands around outside for traction.
Students roll the bottle in one direction, and the bottle responds by rolling back the other way.
Click here Bottle habitat Click here Cloud in a bottle 9. Moisten a quarter and place it on theopen bottle mouth. Remove the bottle from the water and let sit for 2-5 minutes. Try to lift the quarter off of the bottle by only touching the quarter. The volume of a gas changes with changing temperature.