Conservation of Momentum Physics Chapter 6 Section 2 (Pages )

The Big “MO” - In all interactions between isolated objects, momentum is conserved - In every interaction between isolated objects, the change in momentum of the first object is equal to and opposite to the change in momentum of the second object. - Relates to Newton’s Third Law

Law of Conservation of Momentum -The total momentum of all objects interacting with one another remains constant regardless of the nature of the forces between the objects.  Initial momentum = Final momentum  Initial momentum = Final momentum m 1 v 1i + m 2 v 2i = m 1 v 1f + m 2 v 2f m 1 v 1i + m 2 v 2i = m 1 v 1f + m 2 v 2f

Notice how the velocity of the car, and the momentum of the car change when the brick is added, but the total momentum is the same. Notice how the velocity of the car, and the momentum of the car change when the brick is added, but the total momentum is the same.

Chapter 6 Section 2 Homework Page 219 # 2 Page 221 #1

Elastic and Inelastic Collisions Physics Chapter 6 Section 3 (Pages )

Inelastic Collisions - In a perfectly inelastic collision, two objects stick together and move as one mass after the collision. - Momentum is conserved but kinetic energy is not conserved in a perfectly inelastic collision. - In an inelastic collision, kinetic energy is converted to internal elastic potential energy when the objects deform. Some kinetic energy is also converted to sound energy and thermal energy.

Elastic Collisions - In an elastic collision, two objects return to their original shapes and move away from the collision separately. - Both momentum and kinetic energy are conserved in an elastic collision. - Few collisions are elastic or perfectly inelastic

Chapter 6 Section 3 Homework Page 230 #1, 2, 4