Core Idea PS2:Motion and Stability: Forces and Interactions
par LaWonna Dee Knauf

1. PS2.C:Stability and Instability in Physical Systems
1.1. A system can change as it moves in one direction, shifts back and forth,or goes through cyclical patterns
1.1.1. Changes can happen very quickly or very slowly
2. PS2.A:Forces and Motion
2.1. The Push and Pull of objects when they collide.
2.1.1. Change of Speed and Direction
3. PS2.B:Types of Interactions
3.1. Objects exert forces on each other
3.1.1. Electric, magnetic, and gravitational forces