1. Law of Energy Conservation
Mr. Heath
Blue Creek Elementary School

2. Before We Start… Open your Science Book to pages F14 and F15
Read “What is Energy?”
Read the chart on page F15
What types of energy are mentioned on p. F15

3. Law of Conservation of Energy
The law of conservation of energy is a law of science that states that energy cannot be created or destroyed, but only changed from one form into another or transferred from one object to another. 

4. Types of Energy CHEMICAL ELECTRICAL LIGHT MECHANICAL (Motion)
THERMAL (Heat)
NUCLEAR
SOUND (Acoustic)

5. Chemical Energy
CHEMICAL ENERGY is energy that is stored in a substance’s molecules. Chemical energy is released through a chemical reaction.

6. Examples of Chemical Energy
The energy stored in the food we eat
The chemicals that make up an electrical cell or battery
The energy that is stored in a fuel such as gasoline, oil, coal.
Gasoline and Oil are Petroleum Products

7. Electrical Energy
An atom is made up of three particles: Protons have a positive charge. Electrons have a negative charge. Neutrons have a neutral charge. ELECTRICAL ENERGY is released through the flow of electrons. A generator is used to produce alternating current. A cell or battery releases direct current.

8. Electrical Energy Electricity Direct Current Alternating Current
Static Electricity

9. Mechanical Energy MECHANICAL ENERGY is energy of motion. Examples
Moving Windmill
Car Engine
The motion of a watch or clock.

10. Thermal Energy Commonly referred to as HEAT.
It is caused by the motion of molecules.
The faster molecules move, the more heat or thermal energy an object has.
As an object is heated, the movement of the molecules that make it up speed up or accelerate.

11. Thermal Energy Caused by the motion of molecules
The faster the movement of moleculesthe more thermal energyHEAT

12. Nuclear Energy Caused by the splitting of atoms
A huge amount of energy is released
Powers the sun
Used by Nuclear Power Plants
Nuclear Energy  Thermal Energy  Creates Steam  Turns Turbines (Mechanical Energy)  Generates Electricity

13. Conversion of Energy in a Microwave Oven
A microwave oven converts electrical energy into high frequency radio waves that cause the molecules of the food to accelerate or speed up, creating thermal energy or heat.

14. Key Terms Kinetic Energy—energy of motion
A moving car
A ball rolling across the floor
A windmill moving
Potential Energy—energy at rest or stored energy
A rock on top of a hill
A coiled spring
A stretched rubber band

15. Law of Conservation of Energy
The law of conservation of energy is a law of science that states that energy cannot be created or destroyed, but only changed from one form into another or transferred from one object to another. 

16. Law of Conservation of Energy
Energy is transferred from the cue stick to the cue ball. When the cue ball hits the second ball, energy is transferred from the cue ball to the second ball, causing the cue ball to lose energy and to stop, and causing the second ball to move forward. As this second ball collides with the third ball, energy is transferred causing the third ball to travel into the side pocket.

17. Law of Conservation of Energy
The Law of Conservation of Energy can also be demonstrated using Newton’s Cradle.

18. Transfer of Energy in a Light Bulb
In a light bulb, electrical energy passes through the filament. Since the filament, which is made of the mineral tungsten, acts as a resistor, resisting the flow of electricity, electrical energy is transferred to heat or thermal energy. As the filament gets hot, it begins to glow producing light energy.
Electrical Energy
Filament in Light Bulb
Thermal (Heat) Energy
Light Energy

19. Examples of Conversion of Energy EXIT QUIZ
A cell converts _________________ energy to ________________.
A light bulb converts _______________ energy to ______________ and ______________ energy
A car engine converts _______________ energy to _____________ energy.

20. Examples of Conversion of Energy EXIT QUIZ
A generator converts _________________ energy to ________________ energy.
A microphone converts _________________ energy to _________________ energy
A speaker converts ___________________ energy to ________________ energy.

21. chemical electrical electrical light thermal chemical mechanical
CHECK YOUR WORK
chemical
A cell converts _________________ energy to ________________ energy .
A light bulb converts _______________ energy to ______________ and ______________ energy
A car engine converts _______________ energy to _____________________ energy.
electrical
electrical
light
thermal
chemical
mechanical

22. mechanical electrical sound electrical electrical sound
CHECK YOUR WORK
mechanical
A generator converts _________________ energy to ________________ energy.
A microphone converts _________________ energy to _________________ energy
A speaker converts ___________________ energy to ________________ energy.
electrical
sound
electrical
electrical
sound