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Collisions NotesKinetic EnergyThe energy of an object that is due to the object’s __________________right12700KE=12mv2kinetic?energy=12?x?mass?x?(speed)200KE=12mv2kinetic?energy=12?x?mass?x?(speed)2_______________ quantitySI Unit: ____________________Perfectly Inelastic CollisionsA collision in which ___________________________________________________________________________507682533918100__________________________________________________ before and after the collision. Objects become “one” and move at the same ___________________ (vf)m1v1,i+m2v2,i=(m1+m2)vf______________________ is _______ conserved.Examples:409956021662600Football player tackles anotherMeteorite collides with EarthCars crash into each other and are entangled Kinetic Energy is NOT conserved!Some energy converted into __________, ___________ energy, and ________________energy (deforming objects)?KE=?KEf-KEiInitial:KEi=KE1,i+KE2,i=12m1v21,i+12m2v22,iFinal:KEf=KE1,f+KE2,f=12m1v21,f+12m2v22,fTwo clay balls collide head-on in a perfectly inelastic collision. The first ball has a mass of 0.500 kg and an initial velocity of 4.00 m/s to the right. The second ball has a mass of 0.250 kg and an initial velocity of 3.00 m/s to the left. what is the velocity of the balls after the collision?What is the decrease in kinetic energy during the collisions?Elastic CollisionsObjects collide and _______________________________________________ (think “elastic” like a rubber band)524691329708900______________________ & __________________________ are _________________________.p1i+p2,i=p1,f+p2,fKE1,i+KE2,i=KE1,f+KE2,fExamples:Billiard ballsGolf gall and clubA 0.015 kg marble moving to the right at 0.225 m/s makes an elastic head-on collision with a 0.030 kg shooter marble moving to the left at 0.180 m/s. After the collision, the smaller marble moves to the left at 0.315 m/s. Assume that neither marble rotates before or after the collision and that both marbles are moving on a frictionless surface. What is the velocity of the 0.030 kg marble after the collision? Collisions in the Real WorldPerfectly Inelastic Collisions & Elastic Collisions are two extremes.Most real-world collisions are “____________________________________”Objects ___________________________________ or travel together after a collisionKinetic Energy is ______________________ to other forms of energy ................
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