CONSERVATION OF ENERGY

DISCUSSION:

•Where do you get energy from?

•Does your body make energy?

•If you need energy what are you going to do?

•Why don’t you always have energy?

•Where does your energy go?

LAW OF CONSERVATION OF ENERGY

•There is a set amount of energy in the universe.

•All energy is conserved, meaning it is neither

created or destroyed

•Energy can be changed from one form to

another.

CONSERVATION OF ENERGY

• Energy cannot be created or destroyed

• Energy can only be transferred (Changed from one form to

another)

• Heat energy is usually a bi-product of that transfer

Electromagnetic

Energy

Nuclear

Energy

Electrical Energy

Heat

Energy

Chemical

Energy

Mechanical

Energy

ALL FORMS OF ENERGY ARE INTER-CHANGEABLE

DVD: Energy (Discovery)

When I hold the ball above

the ground, what type of

energy does it have?

Once it hits the ground, it doesn’t

have gravitational energy.

Where did the energy go?

We know it was not destroyed so it

must have been converted. What

types of energy did it change into?

Some of that energy is

converted into elastic,

heat, & sound. When

it bounces back up, it

regains gravitational

potential.

COLLISION CREATES HEAT!

Demo: Collision Balls

ENERGY & FRICTION

• Friction turns mechanical energy into heat

WHAT IS THE ORIGINAL SOURCE OF ALL ENERGY IN THE SOLAR SYSTEM?

THE SUN –THE ORIGIN OF ALL OUR ENERGY!

•The Sun is the source for all of our energy in our

solar system.

•The heat caused by pressure and gravity of the sun

causes all energy – even the nuclear reactions!

CONVERSION 1:NUCLEAR ELECTROMAGNETIC (LIGHT) & HEAT ENERGY

Heat Light (EM)

Nuclear

CONVERSION 2: LIGHT CHEMICAL (PHOTOSYNTHESIS)

Chemical (food)

(Photosynthesis)Light from the sun

CONVERSION 3: CHEMICAL CHEMICAL (MEAT)

Chemical

(Photosynthesis)Chemical

(Biomass)

CONVERSION 4: CHEMICAL (MEAT) MECHANICAL & HEAT

Chemical

Mechanical

(Movement)

Heat

GRAVITATIONAL MECHANICAL

Gravitational Mechanical

MECHANICAL ELECTRICAL

Mechanical Electrical

ELECTRICAL LIGHT + HEAT

Electrical Light + Heat

ON YOUR WHITEBOARD COMPLETE THE FOLLOWING EXAMPLE AND SHOW ME YOUR BOARD WHEN DIRECTED

A bow string being pulled back → the arrow

flies forward → makes a crash as it hits the wall

_________________ → ________________ → _________________