Make a boat using some or all of these materials. How many marbles can it hold? Reshape it so it will hold more marbles. Which materials were the most effective? Which materials were the least effective?
SCIENCE FUN~ Seesaw Science: The Hammer-Ruler Trick is from Scientific American. They have several science-related activities that are fun for children. Adults will find easy-to-follow instructions and simple materials lists, as well as additional background to help them explain the key scientific concepts. Great resource!