Today is December 3, 2013
•Grab a worksheet off the back counter and
glue into your notebook on page 48
•Log on to your netbook and go to
www.RecheScience.com
•Get started on “Skate Park” and write at least
2 sentences explaining your answer.
Kinetic and Potential
Energy
Objectives
• You will be able to define and identify Kinetic
and Potential energy.
• You will be able to illustrate examples of
potential and kinetic energy in everyday life
(objects at rest, falling water, and geological
faults) TEKs 7-8A
ALL ENERGY…
Comes from the SUN!
Definition of Energy…
The ability or capacity to do work.
Measured by the capability of doing work:
potential energy
or
the conversion of this capability to motion:
kinetic energy.
Potential Energy…
Energy due to position
or stored energy.
To increase the energy
of an object, you can
raise it to a higher
elevation.
Examples of Potential Energy:
Stretching a rubber band..
-Stores energy
Water at the top of a waterfall..
-Stores energy
Yo–Yo in held in your hand..
-Stores energy because of position
Drawing a Bow…
-Stores energy because of position
Potential Energy
What is Elastic Potential Energy?
 Potential energy due compression or expansion of an elastic
object.
Notice the ball compressing
and expanding
What is Chemical Potential Energy?
• Potential energy stored
within the chemical bonds
of an object
• When the position of an object is altered, it creates
Potential Energy.
• A yo-yo on the table has limited energy but when picked
up, it alters its position and now it has the ability (or
potential) to do more work.
• A bow doesn’t have the capacity to do work, unless it’s
held at an elevated position.
Potential Energy Converted to Kinetic Energy…
When stored energy begins to move, the object
now transfers from potential energy into
kinetic energy.
Standing still
Running
Definition of Kinetic Energy…
The energy of motion.
Examples of Kinetic Energy…
•Shooting a rubber band.
•Water falling over the fall.
•A Yo-Yo in motion.
•Releasing the arrow from
the bow.
Kinetic Energy
•
Summary of What You’ve Learned..
Example using a coin:
• Holding a coin in you hand alters the coins original position.
• The coin has potential energy because it has ability to do work.
• Dropping the coin in the bank, changes the stored energy into
motion.
• This transfers the coin’s energy from potential to kinetic energy.
Energy Stored in Earth
The Earth stores energy
along fault lines which
build ups (potential) and
can be released as an
earthquake (kinetic).
Check for
understanding
Answer the following questions!
The diagram above shows a barrel moving toward a waterfall. The barrel will have
the greatest potential energy at which of these locations?
A
B
C
D
W
X
Y
Z
Which of the following best represents stored
potential energy?
A
B
C
D
Air leaking from a flat tire
Stress built up in a rock fault
Heat given off by a forest fire
Water flowing through a hose
At which point on the roller coaster will the car have the greatest amount of potential energy?
A
B
C
D
W
X
Y
Z
Since you are now done……
1.Make Sure you filled in ALL your notes, go back if
you haven’t.
2.Click on the link below in order to continue
learning!
http://www.brainpop.com/games/coastercreator/
• See if you can make a working roller coaster