Transcript Energy Transformations

Objective (SWBAT): Describe
How Energy Transforms.
** TAKE OUT HW**
INITIAL ACTIVITY:
WHICH ITEM HAS MORE POTENTIAL
ENERGY AND WHY?
1. A BOOK SITTING ON YOUR DESK
2. A BOOK SITTING ON THE ROOF
3. A BOWLING BALL SITTING ON THE FLOOR
4. A BOWLING BALL SITTING ON THE ROOF
Law of Conservation of Energy
 Energy can never be created or
destroyed.
 Energy can only be transferred to
another object or change form.
 TOTAL AMOUNT OF ENERGY NEVER
CHANGES!
Changing Kinetic and Potential Energy
 As an object rises or falls, kinetic and
potential energy are transformed into
each other.
 The TOTAL amount of energy does not
change!
 As one increases, the other decreases
and vice versa.
Changing Forms of Energy
 When energy is “being used” it is really just changing
form. Most machines as well as living things turn one
type of energy into another.
Example:
 Chemical Energy is transformed into kinetic energy
in your body. Without it, you wouldn’t be able to
move!
 A car uses chemical energy (gasoline) and changes it
to kinetic energy (motion)
Generating Electrical Energy
 A GENERATOR is a machine that converts kinetic
energy to electrical energy.
 Burning fossil fuels produces thermal (heat) energy.
 In power plants, steam is used to spin a turbine which
spins the generator providing electricity.
Self Check (Answer in Notebooks)
 1. What does a generator do?
 2. Plants make food through photosynthesis using
the light from the sun. What energy transformation
do you think is happening? Why?