Performing the Chemical Test by Reagent Strip The urine must be collected using appropriate technique and be tested within one hour ofcollection. If tests cannot be performed within this time, the specimen may be refrigerated for upto 8 hours.
Elastic and Inelastic Collisions. A perfectly elastic collision is defined as one in which there is no loss of kinetic energy in the collision. An inelastic collision is one in which part of the kinetic energy is changed to some other form of energy in the collision. Any macroscopic collision between objects will convert some of the kinetic energy into internal energy and other forms of energy, so no large scale impacts are perfectly elastic.
There are two types of collisions that occur: elastic and inelastic. Elastic collisions are when the objects are not permanently deformed and heat is not generated from the collision. Inelastic collisions are when the objects stick together or become permanently deformed. Perfect elastic collisions are rare because usually some heat is generated during a collision.