A tree house. A free house. A secret you and me house. A high up in the leafy branches cozy as can be house. A street house. A neat house. A be sure and wipe your feet house, is not my kind of house at all, Lets go live in a tree house!
Simple Pulley and Lever Activity. This would be a great actiity to understand pulley systems. Real World connection: The principal needs a system to deliver messages to her administrative assistant with the least amount of work (energy).