1. ENERGY

2. WORK is… a FORCE is… ENERGY is… when a FORCE moves an object
the ability to do WORK or cause change
Name 2 things that ARE energy or that HAVE energy
WORK is…
when a FORCE moves an object
a FORCE is…
a push or a pull

3. Energy that is NOT being used Energy that IS being used
There are two main kinds of energy…
POTENTIAL ENERGY
KINETIC ENERGY
STORED energy or
Energy that is NOT being used
Energy in MOTION or
Energy that IS being used
Examples:
Examples:

4. Write a “P” or a “K” under each picture on your paper to tell whether the pictures are showing POTENTIAL or KINETIC energy.
zzzz K P K K P

5. Gravitational Potential Energy
Gravitational Energy is the energy of
position or place. A rock resting at the top
of a hill contains gravitational potential energy.
Hydropower, such as water in a reservoir behind
a dam, is an example of gravitational potential energy.

6. DIFFERENT FORMS OF ENERGY
Both potential & kinetic energy come in many forms. Six of the most common ones are:
Sound Energy
Energy of virbrating particles
THERMAL (HEAT) ENERGY
Energy of the heat IN an object
CHEMICAL ENERGY
Energy in chemical bonds of food, gas, batteries, burning wood etc.

7. DIFFERENT FORMS OF ENERGY (continued)
ELECTRICAL ENERGY
Moving electrical charges
ELECTROMAGNETIC ENERGY (light/radiant)
Light energy, X-rays, radio waves
NUCLEAR ENERGY
Stored in the nucleus of an atom & released when atoms are split or joined together, nuclear reactors, atomic bombs, stars, sun

8. Sound energy is the energy produced by sound vibrations as they travel through air, water, or any other space. This type of energy is a form of mechanical energy. Most people and animals can register this sort of energy with their ears and it’s fairly easy to identify.
Sound Energy

9. Thermal energy is the energy that comes from heat
Thermal energy is the energy that comes from heat. This heat is generated by the movement of tiny particles within an object. The faster these particles move, the more heat is generated. Stoves and matches are examples of objects that conduct thermal energy.
Thermal Energy

10. The energy that results during a chemical reaction is called chemical energy. It is a type of potential energy. Chemical energy is stored within the bonds of the atoms and molecules that make up a substance. Once chemical energy is released from a substance, the substance is transformed into a new substance.
Chemical Energy

11. Electrical energy is energy that is caused by moving electric charges
Electrical energy is energy that is caused by moving electric charges. Since the electric charges are moving, this is a form of kinetic energy. The faster the electric charges are moving the more electrical energy they carry.
Electrical Energy

12. Electromagnetic (Light) Energy
The potential for light to perform work is called light energy. Light energy is the only form of energy that we can actually see directly. Light energy can also be converted into other forms of energy.
Electromagnetic (Light) Energy

13. 1.The energy rele ased by a nuclea r reaction, especi ally by fission or 
fusion.
2. Nuclear energy regarded  as a source of power. Also  called atomic energy.
Nuclear Energy

14. ENERGY CONVERSIONS (ENERGY TRANSFORMATIONS)
Energy can be converted (transformed or changed) from one form to another.
For example…
1) Food has POTENTIAL CHEMICAL energy.
2) When you eat it, the bonds in the atoms are broken and the energy is released to your cells.
Your body CHANGES the chemical energy to KINETIC MECHANICAL ENERGY when you run, jump, write, walk.
4) Finally, your body creates THERMAL (HEAT) ENERGY you can feel because the molecules inside you are moving!

15. Energy Transformations Conversions Between Forms of Energy
A change from one form of energy to another is called energy conversion.
Most forms of energy can be converted into any other form.
Ex. Toaster converts electrical energy to thermal energy. Your body converts chemical energy in the food you eat into the mechanical energy you need to move your muscles.
Usually heat energy is also formed in an
energy conversion.
STOP HERE! Use the rest of this slide show later.
Electrical Energy into Thermal Energy
Chemical Energy into Mechanical Energy

18. During ALL energy conversions some of the energy is changed to heat.

19. Write EACH example in your notes
Think about the energy conversions taking place with a flashlight.
Lightbulb
Batteries
Wires
CHEMICAL ENERGY
ELECTRICAL ENERGY
ELECTROMAGNETIC (Light)ENERGY

20. Label the ENERGY CONVERSIONS in your notes.
ELECTRIC PENCIL SHARPENER
GEARS & BLADES
WIRES
mechanical energy
electrical energy

21. HEATING PAD
WIRES
HEAT
electrical energy
thermal energy

22. PLANT PHOTOSYNTHESIS electromagnetic (light)energy chemical energy SUN
Plant changes sunlight and water into sugar (food) for plant!
electromagnetic
(light)energy
chemical
energy

23. Write the statement above and fill in the blanks.

26. Conservation of Energy
P.E  K.E.  P.E.  K.E. … Is energy lost?
No! Energy is converted!

27. Law of Conservation
The law of conservation of energy states that when one form of energy is converted to another, no energy is destroyed in the process.
Energy cannot be created or destroyed, so the total amount of energy is the same before and after any process. All energy is accounted for.
Conserving Energy
When you hear or read about conserving energy, don’t get confused with the law of conservation of energy. Conserving energy means saving energy, or not wasting it!
In Science, energy is always conserved because its total quantity does not change.

28. Law of Conservation of Energy
Energy can be neither created nor destroyed.
The total energy in a “closed” system is always the same.
The energy may be in different forms, but the amount will be equal.

29. Energy Conversion in a Waterfall
The water at the top of the falls has gravitational potential energy because it is higher than at the bottom. As the water falls, its height decreases, and loses its potential energy. At the same time, its kinetic energy increases because its velocity (speed) increases. The potential energy is converted into kinetic energy.
Gravitational
Potential
Energy
Kinetic Energy

30. Conservation of Energy
Thermal Energy produced by friction is not useful energy- Why?
It IS NOT used to do work.

32. Energy Conversions Worksheet Help
On your OWN sheet of paper fill in the charts. Some of the initial energy changes to more than one form.
Car Moving 6 types
Lamp 2 types
Bell ringing 2 types
A Bomb 4 types
Piano 2 types
Person Riding a Bike 2 Types

33. Perpetual Motion
A machine that would run forever without the addition of energy.
Some energy is wasted due to the thermal energy produced, so perpetual motion is not possible.
So How does the “drinking bird” work?