Momentum and CollisionsMomentum and CollisionsMomentum mass x velocityMomentum mass x velocity

p=mv Units: kgm/sp=mv Units: kgm/s

Momentum is a vector- Direction matters! Momentum is a vector- Direction matters! Be careful when entering the velocity!Be careful when entering the velocity!

Impulse- the change in momentum Impulse- the change in momentum caused by a net force acting on the caused by a net force acting on the system. system.

J=FJ=Ft = mt = mvv

v= v-vv= v-v00

CollisionsCollisionsTwo major types, Elastic, InelasticTwo major types, Elastic, Inelastic

Momentum is conserved in Momentum is conserved in collisions.collisions.

Momentum Before=Momentum AfterMomentum Before=Momentum AfterElastic CollisionElastic Collision

Objects bounce off of each otherObjects bounce off of each otherNo lasting deformityNo lasting deformityNo heat generatedNo heat generatedKinetic Energy is also conservedKinetic Energy is also conserved

Inelastic CollisionsInelastic Collisions

Lasting deformity occursLasting deformity occurs

Objects either stick together at Objects either stick together at the beginning and separate, orthe beginning and separate, or

stick together at the end.stick together at the end.

Kinetic Energy is not conserved, Kinetic Energy is not conserved, since there is energy lost to heat.since there is energy lost to heat.