EnergyFormsandChanges.ppt

Nature of Energy Energy is all around you! You can hear energy as sound. You can see energy as light. And you can feel it as wind. Nature of Energy You use energy when you: hit a softball. lift your book bag. compress a spring. Nature of Energy Living organisms need energy for growth and movement. Nature of Energy Energy is involved when: a bird flies. a bomb explodes. rain falls from the sky. electricity flows in a wire. Nature of Energy What is energy that it can be involved in so many different activities? Energy can be defined as the ability to do work. If an object or organism does work (exerts a force over a distance to move an object) the object or organism uses energy. Nature of Energy Because of the direct connection between energy and work, energy is measured in the same unit as work: joules (J). In addition to using energy to do work, objects gain energy because work is being done on them. Forms of Energy The five main forms of energy are: Heat Chemical Electromagnetic Nuclear Mechanical Heat Energy The internal motion of the atoms is called heat energy, because moving particles produce heat. Heat energy can be produced by friction. Heat energy causes changes in temperature and phase of any form of matter. Chemical Energy Chemical Energy is required to bond atoms together. And when bonds are broken, energy is released. Chemical Energy Fuel and food are forms of stored chemical energy. Electromagnetic Energy Power lines carry electromagnetic energy into your home in the form of electricity. Electromagnetic Energy Light is a form of electromagnetic energy. Each color of light (Roy G Bv) represents a different amount of electromagnetic energy. Electromagnetic Energy is also carried by X-rays, radio waves, and laser light. Nuclear Energy The nucleus of an atom is the source of nuclear energy. Nuclear Energy When the nucleus splits (fission), nuclear energy is released in the form of heat energy and light energy. Nuclear energy is also released when nucl