1. Systems

2. Definition of A System
A system is a group of parts that work together to do a job, perform a function, or produce a result.
Systems can be natural or human-made.

3. Parts of a System All systems are made of parts that work together.
Each part of a system has a specific function, or role in the system.
If one part of a system is missing or does not fulfill its role, the system may not produce the expected result.

5. Practice Question #1
Which of these gives the levels of organization in the universe from smallest to largest?
A. galaxy, solar system, planet, universe
B. galaxy, universe, solar system, planet
C. planet, galaxy, universe, solar system
D. planet, solar system, galaxy, universe

6. Parts of a System Most systems have inputs, processes, and outputs.
An input is something that goes into the system.
A system process is something that happens within the system.
An output is something that comes out of a system.

8. 2 Types of Systems Open Loop System Closed Loop System

9. Open Loop
In an open-loop system, the outputs of the system do not become inputs to the system.
Materials can enter and leave the system.
A food chain is an example of an open-loop system.

10. The cycles of nutrients on Earth are closed-loop systems.
In a closed-loop system, the output of the system goes back into the system as an input
Closed loop systems have two more parts:
- Feedback and monitors
The cycles of nutrients on Earth are closed-loop systems.

11. Open Vs. Closed Loop Input Monitor Input Process Feedback Process
Output
Monitor
Feedback
Input
Output
Process

12. Practice Question #2