1. Bell Work Define energy. What is kinetic energy?
What is potential energy?
In order to find weight, you need to know mass and _________.
*Get out your orange Notes sheet from yesterday.

2. Forms of Energy

3. Think-Jot-Share How did you get to school today?
How did that use energy?

4. Learning Target
I will explain how an object’s mechanical energy is determined.
I will distinguish between the different forms of energy.

5. Mechanical Energy
Mechanical Energy – energy based on the position and motion of an object.
Mechanical energy usually involves moving parts working to create movement
Ex: Machines
A thrown ball is affected by kinetic energy and gravitational potential energy

6. Mechanical Energy The bowling ball has mechanical energy.
When the ball strikes the pins, mechanical energy is transferred to the pins!

7. Examples of Mechanical Energy

8. Mechanical Energy
Mechanical Energy is a combination of an object’s potential energy and its kinetic energy. Ex. See football example pg.170 ME = 32J + 45J ME = 77J
Mechanical Energy = Potential energy + Kinetic energy
(position) (motion)

9. Mechanical Energy Practice
If an object has 50 joules of kinetic energy and 237 joules of potential energy, what is its mechanical energy?
237J + 50J =
Mechanical Energy = Potential energy + Kinetic energy
287J

10. Thermal Energy
Thermal energy – the total amount of potential and kinetic energy of the particles (atoms & molecules) in an object.
A hot object has atoms and molecules that are excited and show rapid movement.
A cooler object's molecules and atoms will show less movement.

11. Electrical Energy
Electrical Energy – energy caused by the movement of electrons
Ex. When you get shocked from touching the doorknob.
May be kinetic or potential energy

12. Chemical Energy
Chemical Energy - the energy released by the breaking of chemical bonds.
Eating food breaks the chemical bonds within it for consumers to use as energy.
Chemical energy can also of the energy in the form of heat being released.

13. Chemical Energy
The chemical bonds in a matchstick store energy that is transformed into thermal energy when the match is struck.

14. Chemical Energy in Food
Chemical energy that is stored in food can be measured in kilocalories (known as calories).
When you look at a food label, what does the number of calories per serving indicate?
The amount of stored energy in one serving of the food.

15. Nuclear Energy
Nuclear Energy - Energy stored in the nucleus of an atom is released during a nuclear reaction.
Ex. Nuclear fusion & nuclear fission

16. Electromagnetic Energy
Electromagnetic energy – light energy that travels in waves
Some have electric properties & some have magnetic properties.
Ex. Visible light, X-rays, ultraviolet radiation, infrared radiation, gamma rays, microwaves, & radio waves

17. ELECTROMAGNETIC ENERGY
QUIZ TIME!
What type of energy cooks food in a microwave oven?
ELECTROMAGNETIC ENERGY
What type of energy is the spinning plate inside of a microwave oven?
MECHANICAL ENERGY

18. What type of energy is shown below?
Chemical Energy

19. What types of energy are shown below?
Electrical, Mechanical, and
Electromagnetic Energy

20. What type of energy is shown below?
Chemical Energy

21. What type of energy is shown below?
Thermal Energy

22. What types of energy are shown below?
Mechanical and Thermal Energy

23. Practice
Do the practice problems on your notes sheet.

24. Assignment Complete the questions on pg. 173
#1, #2, & Writing in Science