1. Energy

2. What is energy? Energy is the ability to do work
Work is a transfer of energy
If you lift a box you do work, this work requires energy
2 main types of energy: Kinetic and Potential
Units are Joules!

3. Kinetic energy KE depends on mass and speed on the object KE= ½ mv2
Tailgaters
Pg 448: 1-3

4. Potential energy Energy that is stored due to position
Gravitational PE is due to height and (g=9.8)
PE= mgh
Cliff diving

5. Elastic Potential Energy
Energy of an object that is stretched or compressed
Ex. Rubber band, springs, bouncing ball

6. Other forms of energy
Mechanical energy- sum of an object’s potential and kinetic energy
PE+KE=ME
Thermal Energy- heat energy, if hot enough they emit visible light
Chemical Energy- energy stored in chemical bonds
Ex. Burning wood or gas

7. More forms of energy
Sound energy- waves carry energy, you can feel sound
Electrical energy- energy associated with electric charges
Electromagnetic energy- waves that travel through space, EM Spectrum
Nuclear energy- energy stored in atomic nuclei

8. Energy Conversion and Conservation

9. Energy Conversion Energy can be converted from one form to another
Ex. Pendulum to the face
Striking a match
microwave

10. Conservation of Energy
Energy can’t be created or destroyed
Why then does a car stop moving if you let it coast?
Pool balls colliding
Pendulum

11. Energy Conversions PE turns into KE as an object falls
PE and KE are constantly changing
Pendulums
Pole vaulting

12. Energy Conversion Calculations
Initial (KE+PE) = final (KE+PE)
Pg 458: 1-3

13. Energy and Mass
E=mc2
Energy and mass are equivalent and can be turned into one another
A tiny amount of matter creates a tremendous amount of energy
1 g of TNT 2931J
Cold fusion

14. Class Work
Pg 459: 7-10

15. 1. Design a roller coaster and explain all parts of it where there is an energy transfer or conversion.
2.ME, PE, KE, Friction, Sound, Heat all need to be included in the coaster somewhere
3. Draw a picture and color it, and name it