## Learning Targets

**3.01B -**I can apply Newton's first law (law of inertia) to make predictions in physical situations.

**3.02A -**I understand the relationship between net force, mass, and acceleration.

**3.03B -**I can describe how Newton’s 3rd Law applies to physical situations and identify 3rd law pairs.

## Can You...

**(3.01B)**Newton’s First Law, the law of inertia.**An object will continue to move at a constant velocity unless it feels an unbalanced push or pull.**- Therefore, objects acted upon by balanced forces will not accelerate -- they instead remain at constant velocity.
- “Inertia” refers to an object’s “resistance” to change in its constant velocity motion. Inertia is not an interaction between objects, and therefore inertia is not a force.

**(3.02A)**Newton's 2nd Law: The net force on an object divided by its mass equals its acceleration, or- When the forces acting on an object are unbalanced, the object will accelerate. Because acceleration is a change in velocity, and velocity includes both speed and direction,
**a net force will change the speed and/or the direction of an object's motion.** **(3.03B)**Newton’s Third Law:**Forces are interactions that can be described in pairs of equal magnitude acting in opposite directions on the two objects**. F_{by A on B}= -F_{by B on A}

**F**

_{net}= m·a