1. Energy and Energy Resources
What Is Energy (chapter 5 section 1)
Energy Conversions ( Chapter 5 sec 2)

2. What is Energy? Energy is the ability to do work
Work occurs when a force is applied to an object in the same direction that the object moves
Energy is transferred from one object to another

3. Kinetic Energy Kinetic energy(KE) is the energy of motion
All moving objects have kinetic energy
The amount of kinetic energy that an object has can be calculated by the following formula:
KE= mv2/2 (m = mass v = velocity or speed)
The more mass an object has, the more kinetic energy it has
The faster an object is moving, the more kinetic energy

4. Potential Energy
Potential energy is the energy that an object has because of its position; it is STORED ENERGY (has the potential to do work)
Gravitational Potential Energy (GPE)
Elastic Potential Energy

5. Gravitational Potential Energy
Gravitational Potential Energy is energy that is stored due to the gravitational attraction of the Earth on the object
When an object is lifted up off of the ground, a force is applied to lift the object. The energy used to lift the object is stored in the object
GPE is calculated with the formula
GPE = Weight X height
Units = Joules ( newton/meters)

6. Elastic Potential Energy
Energy stored as a result of the deformation (changing the shape) of an elastic object
Examples:
Stretching a spring
Stretching an elastic band

7. Mechanical Energy
Mechanical Energy (ME) is the total energy of kinetic(KE)and potential energy (PE)
ME = KE + PE
As KE increases, PE decreases
As KE decreases, PE increases

8. Kinetic and Potential Energy Video
The Story of Kinetic and Potential Energy

9. Other Forms of Energy (most can exist as potential and kinetic forms)
Thermal energy – the energy that exists due to the kinetic energy of moving atoms that make up the matter

10. Other Forms of Energy (most can exist as potential and kinetic forms)
Chemical energy – the energy that comes from the rearrangement arrangement of atoms
Food energy is a type of chemical energy
Electrical energy – the energy of moving electrons

11. Other Forms of Energy (most can exist as potential and kinetic forms)
Sound energy – the energy caused by an objects vibration; travels in waves
Must have a medium (matter) to travel
Light (radiant) energy – the energy produced by the vibration of electrically charged particles; exists as a wave and a particle
Does not need a medium to travel; can travel in a vacuum(where the is no matter)

12. Other Forms of Energy (most can exist as potential and kinetic forms)
Nuclear energy – the energy that comes from changes in the nucleus of an atom
Fusion – the joining of nuclei
Fission – the splitting of nuclei

13. The Seven Forms of Energy Video Clip

14. All forms of energy can change (convert) into other forms of energy
Energy conversion is a change from one form of energy to another

15. Examples of energy conversions
Potential to kinetic
Kinetic to potential

16. Examples of energy conversions
Food energy(chemical) to mechanical or kinetic energy ( cereal for breakfast used to allow you to move)

17. Conversions Involving Chemical Energy In Plants

18. Why Energy Conversions Are Important
Energy conversions are needed for everything we do
Without energy conversions we could not live or do all the things we do
Machines can make work easier by converting energy into the form of energy needed to do the work.
Not all energy conversions are useful for the work that you are trying to do – some is “wasted” energy

19. Energy and Machines