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# 6.P.3A.2 Energy Transformations

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## Michele Bahm

on 23 October 2017

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#### Transcript of 6.P.3A.2 Energy Transformations

Mechanical energy transformations may involve other kinds of energy. Ex:
When the book in the previous example hits the floor the kinetic energy is transformed into other forms of energy such as
sound
and
heat
Transformations may occur between any of the various types of energy but the energy itself is always around in some form.
IT IS NEVER
LOST

Told ya! Now please take a moment to enjoy this pun.
Mechanical energy transformations
The mechanical energy that an object has may be kinetic or potential energy or some combination of the two

Energy transformations can occur between the two types of mechanical energy
More examples:
When a rubber band is
stretched
, kinetic energy is transformed into
potential
energy

The further back you stretch the rubber band, the
greater
potential energy, and the more energy that will be transferred as
kinetic
energy.

When a stretched rubber band is
released
its potential energy is transformed into kinetic energy as the rubber band
moves
Law of
Conservation
of Energy
Energy cannot be
created
or
destroyed

Energy can be
transformed
from one form into another, but the total amount of energy
never
changes
Energy Conservation and Transformations
Examples of
potential kinetic
mechanical transformations
when water is
behind
a dam, it has potential energy. The potential energy of the water changes to kinetic energy in the
movement
of the water as it flows over the dam

Yes... even more examples!
When a book is
lifted
to a shelf, kinetic energy is transformed into potential energy

If the book
falls
off the shelf the potential energy is transformed into kinetic energy
Energy is
conserved
during energy transformations:

● Transformations may occur between any of the various types of energy but energy itself is
never
lost.

● The potential energy that a book on a shelf has is from the kinetic energy it took to
lift
the book to the shelf.

● A swing pendulum also demonstrates how energy is conserved as it
changes
forms.

○ Kinetic energy is used to
pull
a ball back; this energy is
transformed
into potential energy.
○ The ball is
released
and the ball swings back toward the other three balls (kinetic energy).
○ The moving ball
strikes
the stationary ball and the kinetic energy is transferred from one ball to the next.
○ The last ball swings away from the others because of the
kinetic
energy that was transferred to the ball.

Examples:

Green plants transform the Sun's energy into food which is a form of stored chemical energy

Animals use chemical energy from food to move. The chemical energy in the food is transformed to mechanical energy
What, More Examples?!
Carbon-based fuels are all derived from the bodies of plants and/or animals. When carbon-based fuels (wood, natural gas, petroleum, or coal) are burned, the chemical energy is transformed to heat energy
They don't stop coming!
The heat energy from fuels can be transformed to electrical energy at a power plant

In an electrical circuit the electrical energy can be transformed into many different types of energy such as mechanical, sound, light, and heat.
Last one, I promise :)
All of the energy from the electric circuit eventually changes to another form, much of its heat energy. The energy from all of these transformations still exists. The total amount of energy is conserved.
Not this
http://www.science-animations.com/support-files/energy.swf
OUCH!!!!
electricity could be transformed into other forms of energy (including light, heat, and sound)
Recall:
The Pendulum
The Pendulum
○ Kinetic energy is used to
pull
a ball back; this energy is
transformed
into potential energy.
○ The ball is
released
and the ball
swings
back toward the other three balls (kinetic energy).
○ The moving ball
strikes
the stationary ball and the kinetic energy is transferred from one ball to the next.
○ The last ball swings away from the others because of the
kinetic
energy that was transferred to the ball.
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