1. Vocabulary
Law of conservation of energy - Energy (E) CANNOT be created or destroyed, only changed in form!!!
Energy = property of an object /system that enables it to do work
Mechanical energy - due to position or the movement (PE, KE or sum of the two)
Chemical energy - atoms, ions, and molecules and bonds
Electrical energy - associated with current and voltage
Thermal energy (heat) - the movement of molecules
Light energy - associated with electromagnetic waves
Sound energy - associated longitudinal mechanical waves

2. PS Explain how the law of conservation of energy applies to the transformation of various forms of energy (including mechanical energy, electrical energy, chemical energy, light energy, sound energy, and thermal energy).

3. Law of conservation of energy
Energy (E) CANNOT be created or destroyed, only changed in form!!!
E can be transformed from one form to another, but the total amount never changes!
E in = E out

4. Energy
Energy = property of an object /system that enables it to do work
If you consider the whole system, total amount of energy never changes

5. Types of Energy
Mechanical energy - due to position or the movement (PE, KE or sum of the two)
Chemical energy - atoms, ions, and molecules and bonds
will change to another form of E during chemical reaction

6. Types of Energy
Electrical energy - associated with current and voltage
Thermal energy (heat) - the movement of molecules

7. Types of Energy Light energy - associated with electromagnetic waves
Sound energy - associated longitudinal mechanical waves

8. KEY CONCEPT!!!!!
Different kinds of energy can change from one form to another without changing the total amount of energy!!!!

9. Example: Electric circuit with a battery and a light bulb burning
Chemical energy changes to electric energy
Electric energy flows through the light bulb and turns electric energy to light and heat
Energy in = energy out

10. Please Explain to ME!!!!!!
What type of E transformations occur when a baseball is thrown to another ball player????
Player gets ________ from food and changes it to ___________ when throws the ball
The work done on the ball converts the energy of the arm movement to ____________ of the moving ball
When the second player catches the ball, the ball does work on the player’s hand and glove giving them some _____________
The player that catches the ball absorbs the energy of the ball and this energy turns to ____________.
The total heat produced is _________ to the energy used to throw the ball.

11. Review!!! What does the law of conservation of energy state?
When energy changes from one state to another, what happens to the total amount of energy in the system?
What is defined as the property of an object /system that enables it to do work?

12. Determine the type of energy being described!!
energy due to position or the movement (PE, KE or sum of the two)
energy associated with atoms, ions, and molecules and bonds
energy associated with current and voltage
energy associated with the movement of molecules
energy associated with electromagnetic waves
energy associated longitudinal mechanical waves

13. Determine what type of energy transformation is taking place!
When you eat food
When you hit a baseball
When you plug in a light
When you go for a run and start to sweat
When a windmill produces the electricity to run a farm

14. Vocabulary
Mechanical energy (ME)- due to position or the movement (PE, KE or sum of the two)
Gravitational potential energy (GPE)- Energy of position
Kinetic energy (KE)– Energy of motion

15. PS Explain the factors that determine potential and kinetic energy and the transformation of one to the other.

16. Remember - Mechanical energy is due to the position of something or the movement of something.
Mechanical energy can be potential, kinetic or the sum of the two.

17. Gravitational Potential Energy (GPE)
Energy of position
greater when the height is greater
greater when the weight of the object is greater

18. Kinetic Energy (KE) energy of motion greater when the speed is greater
greater when the mass of the object is greater.

19. Potential energy: energy of position
Where does the boulder have the most PE?
KE?
Where is it even?

20. Describe the energy conversions in this picture:
At the top:
¼ of the way down:
½ way down:
¾ down
At the bottom:
Is the sum of KE + PE a constant?

21. Where are PE and KE maximums in this picture?

22. Kinetic and potential energy convert to one another
PE max
PE max
no KE
no KE
KE max
KE max
no PE
no PE

23. Review What type of energy are GPE and KE?
What is the energy of position?
What is the energy of motion?
What 2 factors affect GPE?
What 2 factors affect KE?