1. Forces

2. What is a Force?
Force – a push or pull - measured in Newtons (N) - vector quantity (can be positive or negative)

3. Newton’s 1st Law of Motion
An object at rest remains at rest and an object in motion remains in motion unless acted upon by an unbalanced outside force.
Balanced Force Unbalanced
At rest or constant velocity
Accelerates

4. Equilibrium is another word for balanced.

5. Inertia
the tendency of an object to resist a change in speed or direction.
More mass means more inertia because it requires a greater force to change its speed or direction.

6. Newton’s 1st Law of Motion is often referred to as the Law of Inertia