Week 4 Assignment 2

SCI 110

Nov 5th 2012

Everything around us is made up of particles, atoms, and molecules. All the substances there are to name are, at the core and in there simplest form, made of those three things. Different objects are made up of different molecules, and different molecules have their own properties with how they react to the elements and retain heat, how fast they heat, and how fast they cool. Heat is based on the total internal energy of the molecules of a body ( Tillery 2009). Larger object tend to have more internal energy than smaller objects, especially if the objects in question are the same substance, but if both object have the same temperature they are believed to have about the same molecular kinetic energy (Tillery 2009). The molecular energy is broken up into two different categories, external and internal energy. The difference between the two is that external energy refers the kinetic and potential energy of an every-day sized object, and internal refers the kinetic and potential energy of the molecules of an object. Take the tire on a car for example, it has external kinetic energy as it is rotating and that energy is transferred to the internal kinetic energy of the molecules between the tire and the surface of the road, which the consequence is both surface of the road and tire to be heated. The amount the road and tire are heated are directly related to how fast the tire is spinning and how much friction is being created between the two surfaces. This also serves as a good example for basic definition of heat, which can be described as the movement that occurs between two objects of different temperature when the objects are brought together. An example would be mixing hot water with cold water. The heat would be transferred to the cold water and the end result of the two mixing would be warm water with a