Download Energy Notes - davis.k12.ut.us

Objective 1. Students will define energy.
2. Students will name and describe the forms of energy.
3. Students will write and use any formulas to describe energy.
V. Energy
a. Energy is defined as the ability to do work, which means that energy must cause motion.
b. There are many forms of energy and according to the law of conservation of energy,
energy can not be created or destroyed but can change forms.
1. Electrical energy: is energy that comes from the motion of electrons. Electricity
can flow from one place to another. When electricity builds up in an object we
call that static electricity. We can get rid of static electricity by touching
something which allows the electrons to move.
2. Chemical energy: is energy that comes from the reactions of elements. Chemical
energy can be found in food, batteries. Chemical energy occurs when one type of
chemical changes into another or when chemical bonds are broken and reformed.
3. Mechanical energy: is energy that comes from position or motion of an object. It
includes all types of kinetic energy. As an object moves it will have mechanical
energy.
4. Nuclear energy: is the energy that comes from the nucleus of an atom. There are
two ways to get nuclear energy:
a. Fusion: when the nucleus of an atom comes together to form new bonds
energy is released as heat, light and new matter may be created.
b. Fission: when the nucleus of an atom is split some of the matter in the
nucleus may be transformed into energy as heat and light.
5. Heat energy: is the energy that comes from the motion of particles or atoms.
Temperature is a measure of the movement of the particles. Heat energy always
flows from a hot object to a colder object. There are three ways in which heat
energy flows from one object to another.
a. Conduction: is the transfer of heat energy by direct contact.
b. Convection: is the transfer of heat energy by the movement of a heated fluid
(liquid or gas).
c. Radiation: is the transfer of heat energy through space by infrared waves.
6. Electromagnetic energy: is the energy that passes through space in the form of
waves. Electromagnetic energy makes up the electromagnetic spectrum and is
sometimes referred to as radiant energy.
7. Kinetic energy: is the energy that results from an objects movement.
a. KE=1/2 mv2
8. Potential energy: is the energy stored in an object as a result from its change in
motion.
a. PE= mgh