1. Linear Momentum

2. Law of Conservation of Momentum
This is one of four conservation laws in physics that are very important (charge, energy, and mass also)
We will only study linear momentum (angular momentum is an AP Physics C topic only)
Useful to use for interactions (like collisions)

3. Momentum and Its Relation to Force
Momentum is the product of an object’s mass and velocity
Units of kg∙m/s
Momentum comes from Newton’s Second Law
The rate of change of momentum (derivative of momentum) is equal to the net force acting on it

4. Conservation of Momentum
momentum before = momentum after
The total momentum of an isolated system of objects remains constant
System = set of objects chosen that interact with each other
Isolated = the only significant forces are between the objects in the system
i.e., there is no net forces acting on the system
Often occurs in explosions

5. Collisions and Impulse
Impulse = the product of force and the time over which the force acts
Impulse is the area under an F-t curve

6. Conservation of Energy and Momentum in Collisions
Elastic Collision = total kinetic energy is conserved
Inelastic Collision = energy is conserved, but is no longer kinetic

7. 1-D Collisions Elastic Collisions Inelastic Collisions
True for explosions, or where friction is present
If it is completely inelastic, the objects will stick together

8. Collision in 2-D or 3-D Momentum in each direction is conserved
px is conserved, py etc.