1. Bell Ringer 12/3 Page 39 A summary of the experiment's results, and how those results match up to your hypothesis is called what?

2. Energy No Energy can enter or leave Energy can Energy can enter and leave enter & leave Materials No Materials can enter or leave No Materials can Materials can enter or leave enter or leave A system is made up of several parts that work together to perform a single task

3. A closed-loop system is a system that is self-contained. These systems often possess feedback mechanisms that act as control devices to keep changes within desired limits. Ex. Thermostat – furnace Motion sensor for lights Refrigerator An open-loop system is a system with no feedback; it is an uncontrolled system. In an open-loop system, there is no loop connecting the output of the system to the input to the system. Ex. Light switch TV remote Microwave Input - the raw material that is put into a system for processing Output - the finished product or waste from a process