Chapter 3 lesson 4 Models as Tools in Science Vocab System Input Process Output Feedback

Model Any representation of an object or process Examples: Pictures, diagrams, Computer Programs, Mathematical equations Use: Scientists use models to understand things that cannot observe directly. To understand how a system works To predict changes in system based on input and feedback

System A group of parts that work together to perform a function or produce a result Examples: Heating and cooling system, school system, Sea breeze, Ecosystem, Solar System Use: Scientists use models to understand things that cannot observe directly.

Input The material or energy that goes into a system. S: Structures Examples: Sun’s energy,

What happens in a system Process What happens in a system

Material or energy that comes out of a system S: result Output Material or energy that comes out of a system S: result

Output that changes the system in some way. Feedback Output that changes the system in some way.