Collisions in Two DimensionsSection 7.7

Conservation of Momentum

• How do we apply conservation of momentum to two dimensions?

Two-Dimensions

• Conservation of energy and momentum can be analyzed in two or three dimensions

• Math can quickly become complex• We will start with one object in motion and the second at

rest

Example

• Billiard ball A moving with speed vA = 3.0 m/s in the +x direction strikes an equal mass ball B initially at rest

• After the collision, ball A moves 45° above the x axis

• Ball B moves 45° below the x axis

• What are their final speeds?

Homework

• Read Section 7.7• Do Problems # 40, 41, Page 189