ENERGYForms of

Forms of EnergyWhat are the different forms of energy?

Energy forms are either Energy forms are either potentialpotential or or kinetickinetic..

PotentialPotential energy comes in forms that are stored energy comes in forms that are stored including — chemical, gravitational, mechanical, including — chemical, gravitational, mechanical, and nuclear. and nuclear.

KineticKinetic energy forms are doing work — like energy forms are doing work — like electrical, heat, light, motion, and sound.electrical, heat, light, motion, and sound.

Something that’s Something that’s not doing not doing

anything right anything right now but now but could could

be doing be doing something.something.

Wait, what is Wait, what is potential energy?potential energy?

Like me every Like me every night, just staring night, just staring

blankly at my blankly at my homework?homework?

Nice metaphor. It’s more Nice metaphor. It’s more like when you stretch a like when you stretch a

rubber band. When you hold rubber band. When you hold it stretched out, is it it stretched out, is it

moving? Could it move?moving? Could it move?

Nice metaphor. It’s more Nice metaphor. It’s more like when you stretch a like when you stretch a

rubber band. When you hold rubber band. When you hold it stretched out, is it it stretched out, is it

moving? Could it move?moving? Could it move?

Let’s think... Why does a stretched rubber band have potential energy?

The The potential energypotential energy is there, but it’s is there, but it’s only when you let go that something only when you let go that something happens. The stored energy of the happens. The stored energy of the

stretched rubber band is what we call stretched rubber band is what we call potential energy. It is stored there potential energy. It is stored there

because of the position of the object. because of the position of the object.

The The potential energypotential energy is there, but it’s is there, but it’s only when you let go that something only when you let go that something happens. The stored energy of the happens. The stored energy of the

stretched rubber band is what we call stretched rubber band is what we call potential energy. It is stored there potential energy. It is stored there

because of the position of the object. because of the position of the object.

IDEAS?What are some other examples of potential

energy that you can think of ?

Potential Energy

Holding a bowling ball 3 feet above Holding a bowling ball 3 feet above the groundthe ground

Pulling an arrow back on a bowPulling an arrow back on a bow

A car parked at the top of a hillA car parked at the top of a hill

A boulder sitting at the top of a A boulder sitting at the top of a mountainmountain

Water behind a damWater behind a dam

Pressure in an unopened soda bottle Pressure in an unopened soda bottle

Energy that is stored

Something that’s Something that’s doing something, doing something,

like something like something falling or in falling or in

motion.motion.

So can you guess So can you guess what what kinetic energykinetic energy

is?is?

Like you getting in gear and Like you getting in gear and actually actually doingdoing your your

homework?homework?

More like the energy that More like the energy that propels the rubber band through propels the rubber band through

the air. It’s when energy is the air. It’s when energy is active, and is causing something active, and is causing something

to be in motion.to be in motion.

More like the energy that More like the energy that propels the rubber band through propels the rubber band through

the air. It’s when energy is the air. It’s when energy is active, and is causing something active, and is causing something

to be in motion.to be in motion.

Kinetic energyKinetic energy is what is what causes objects to be in causes objects to be in motion. Can we think of motion. Can we think of

any examples? any examples?

Kinetic energyKinetic energy is what is what causes objects to be in causes objects to be in motion. Can we think of motion. Can we think of

any examples? any examples?

IDEAS?What are some other examples of kinetic

energy that you can think of ?

Kinetic Energy

A bowling ball dropping to the A bowling ball dropping to the groundground

A car zooming down the highwayA car zooming down the highway

Kicking a soccer ballKicking a soccer ball

A roller coaster whizzing through A roller coaster whizzing through loopsloops

An arrow flying through the airAn arrow flying through the air

Energy that is active

PAUSELet’s try demonstrating the two forms of energy...

POTENTIAL ENERGY

Any brave volunteers?

KINETIC ENERGYRemember, safety comes first!

When you go home tonight, think When you go home tonight, think about the forms of energy, about the forms of energy,

potential potential and and kinetickinetic. Can you . Can you find examples in everyday life of find examples in everyday life of these two forms of energy? Be these two forms of energy? Be prepared to come to class and prepared to come to class and

share.share.

When you go home tonight, think When you go home tonight, think about the forms of energy, about the forms of energy,

potential potential and and kinetickinetic. Can you . Can you find examples in everyday life of find examples in everyday life of these two forms of energy? Be these two forms of energy? Be prepared to come to class and prepared to come to class and

share.share.