Download energy Notes File

Energy!
IT MAKES THINGS MOVE
Objectives
 SWBAT
Identify
Define
the seven forms of energy
energy
What is Energy?
 Objects
move because of energy
 Energy: the ability to make things
move
Energy
Energy
is NOT like matter
has no mass and does not take
up space
Forms of Energy
 1.
Chemical energy: holds atoms in molecules together.
Chemical energy can be released during chemical
reactions; such as the burning of wood
 Ex:
H2O2 : hydrogen peroxide
 2.
Electrical energy: movement of electrons through
matter.
 Ex:
electricity
Forms of energy continued…..
 3.
Heat energy: is the vibration of
particles within matter. Faster the
particles vibrate, the more heat energy
they have.
 Ex:
think of some examples and share with the
class.
 4.
Light energy: energy carried by light
Forms of energy continued…..

5. Mechanical energy: the energy of moving things


Ex: a pulley, washing machine, air conditioner, generator
6. Nuclear energy: holds the protons and neutrons together in
the nucleus.
Forms of energy continued

7. Sound energy: sound energy vibrates air
molecules. The vibrating molecules move tiny
bones in your ear. The message is then interpreted
by the brain. Sound energy vibrates through matter;
water, air…..
 Ex:
make a loudspeaker and say hello through the
opening…what do you feel as your voice moves through
the paper?
Can energy change forms?

Energy can be changed, or converted, from one form to another. For
example, a hot air balloon:
 The
air that fills the balloon is heated
 The
heat energy causes the air molecules inside the balloon to move
very fast
 Warm
air rises above cool air: The temperature inside the balloon is
much different than outside the balloon so this difference creates “lift”
or causes the balloon to rise
 In
other words the heat energy used to lift the balloon is converted into
mechanical energy to move the balloon.

What other energy, not mentioned in notes, is used to move the balloon?
Potential and Kinetic Energy

Potential Energy: Energy of position; stored energy that
is not being used

Kinetic Energy: Moving energy or energy in action
Potential Energy

A roller coaster sits on top of a hill. It is about to speed
down the track, but it has not moved yet.

It has energy because of where it is.

Once the roller coaster begins to move the potential energy
converts to Kinetic energy.

Substances like wood, coal, oil and gasoline have stored energy
because of their chemical composition. They can burn.

When they burn they give off heat and light energy
Potential Energy
Kinetic Energy

The potential energy of the roller coaster at the top of
the hill is converted into kinetic energy as the roller
coaster speeds down the hill
Conservation of Energy

The sum of KE and PE remain constant at each
successive position