Conservation of Momentum

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Momentum Conservation

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Presentation transcript:

Conservation of Momentum pbefore=pafter

Definition Within a closed system (a system that does not exchange energy with the outside environment) momentum is always conserved. Momentum can neither be gained or lost within a closed system.

Dump Truck and Bicycle If a bicyclist traveling at maximum speed runs into a stationary dump truck, what happens? If a dump truck moving at 5 m/s runs into a stationary bicyclist, what happens? If a dump truck moving at 30 m/s runs head-on into a bicyclist at maximum speed, what happens?

Equal Mass If two objects with equal mass, traveling at the same speed, get into a head-on collision, what happens?

Low Friction Push A child and her father are standing still in the center of an ice rink. If the child tries to push her father, what will happen? Demo

Collisions In the collision of any two objects, the added momentum of both objects has to be the same before and after the collision

Three Types of Collisions Elastic Two objects collide and bounce off of each other with no deformation Inelastic Two objects collide with each other, crumple and deform, and sometimes stick together Explosion When one object becomes two or more objects In a conventional explosion, one object breaks into many pieces that fly in all directions