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Physics 30 Lesson 2.2: Elastic and Inelastic Collisions Isolated systems: No external net force Kinetic energy may or may not be conserved Elastic collision: Kinetic energy is conserved Inelastic collision: Kinetic energy is not conserved Example: For Billiard balls A and B below, find the velocity of B after the collision and determine if the collision is elastic or inelastic Before After B 1.0 m/s ? m/s A B A 4.0 m/s 0.30 kg 0.50 kg 0.50 kg 0.30 kgMomentum in an isolated system is always conserved. This law is a direct result of Newton's third law ct motion where the change in momentum of one object is equal and opposite the change in momentum of the other object. The combined change in momentum is zero. Kinetic enerQY. on the other hand, can easily be transformed into heat, sound, and the detormation of objects. The Conservation of Energy (i.e. the total amount of energy in an isolated system does not change, but energy can be transformed into other types) does not depend on Newton's Laws. In inelastic collisions some of the kinetic energy is lost due to: {3; Friction between the objects could cause some of it to be converted to heat (thermal energy). f; The object was permanently changed (broken, bent, snapped, twisted, etc.) from its original shape. This includes it the objects are stuck together after the collision {3; Some energy might have been converted into the energy of a sound or light In the real world, it is impossible to achieve a perfectly elastic collision. However, collisions between two hard objects (billiard balls, steel pucks...) come very close to being elastic. Example:Billiard balls Aand B stick together after the collision. Calculate their velocity atterthe collision and determine if it is elastic or inelastic. Before After 0.50 kg ? mts 4.0 ms 0.50 kg 0.30 kg 0.30 kg