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

2. 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

3. 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.

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

5. What happens in a system
Process
What happens in a system

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

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