Download Changing Energy Energy is the ability to do work. The many forms of

Changing Energy
Energy is the ability to do work. The many forms of energy include mechanical
(including sound), electrical, thermal, light (radiant), chemical, and nuclear. These forms
of energy can be separated into 2 types-Potential and Kinetic Energy. Potential energy is the
stored energy of an object based on its position. (Ex: Swimmer on a diving board) Kinetic
energy is the energy of a moving object. Ex: (Swimmer diving into the pool)
You have learned that energy is the ability to do work or cause change. There are
many different forms of energy. We may use one form of energy to run our cars, another to
heat our homes, and still another to send TV pictures. People use large amounts of energy to
help them perform work. Scientists are always looking for new energy sources.
Where does energy go when it is used? Energy doesn’t actually “get used,” it turns into
another form of energy! For example, when runners compete in a long race, they use large
amounts of energy. Most of the energy is changed into heat. These are other examples of the
energy changing into heat all around you. Saw a piece of wood and then feel the blade and the
wood. Both will feel warm. The mechanical energy of the saw was changed into heat.
You have already learned that matter cannot be created or destroyed. What about
energy? It can change form, but it is never destroyed. The Law of Conservation of Energy
states that energy is never created or destroyed—only changed from one form to another.
Matter can be changed from one state to another when thermal (heat) energy is
absorbed or released. This change is known as a change in state. Some examples include:
• Vaporization (boiling and evaporation) is a change from a liquid state to a gaseous
state.
• Condensation is a change from gaseous state to liquid state.
• Freezing is a change from liquid state to solid state.
• Melting is a change from solid state to liquid state.
Mankind uses large amounts of energy. Energy can exist in various forms, such as
mechanical, chemical, electrical, heat, sound, and nuclear. Energy can be converted from one
form to another. When energy is used, heat energy is formed. Some amount of energy is
always lost as heat. Energy can never be created or destroyed. An understanding of energy is
fundamental to all branches of science.
Complete the following, paste or staple into your notebook.
1. Energy is the ability to _______________________________________________.
2. Kinetic energy is ___________________________________________________.
3. Potential energy is __________________________________________________.
4. Define the law of conservation of energy. ________________________________________
___________________________________________________________________________
___________________________________________________________________________.
5. Vaporization is the change from a __________________ to a _______________.
6. __________________________ is a change from gas to liquid.
7. ____________________________is a change from solid to liquid.
8. __________________________is a change from liquid to solid.
9. A TV changes _____________________________ into sound and _____________ energy.
10. A flashlight changes chemical energy in batteries to ___________________ energy.