1. Warm up: Write down 10 things you can do conserve energy
Grab a Book!!!

2. Kinetic-Potential-Chemical
Rock balance on the edge of a cliff
A piece of coal
A landslide
Roller coaster car
A diver on a 10 meter platform
A car battery
tides

3. Goals Describe heat transfer by conduction, convection, and radiation
Describe conversion of mechanical energy into heat
Describe the second law of thermodynamics and how it relates to electricity

4. Heat transfer : Activity A
There are station2’s: hot water and cups.
On your paper :
Which will keep the water hot longer
Metal or Styrofoam and why?
Design an experiment to prove your hypothesis
Carry out experiment after I see what you wrote down
Write down your results
There are station 1’s :100W light Bulb
On your paper :
Describe what happens to the temperature of your hand as you move it towards and away from the bulb.
Describe the change in temp of your hand when you hold a piece of paper between your hand and the bulb
Compare and explain the temp difference of your hand when u hold it above the light bulb verses near the light bulb

5. Station 3 is at your table
Differences in temp inside over time and why?
Design an experiment.

6. Time in minutes
Uninsulated Solar cooker
Temp in Celsius
Insulated Solar cooker 66 30 76 88 60 82 94

7. Thursday December 10 Warm Up : What is heat? Grab a book!
Energy transferred from a hotter system to a cooler system when they contact

8. Solar Cooker which one get hotter faster?
Time in minutes
Uninsulated Solar cooker
Temp in Celsius
Insulated Solar cooker 66 30 76 88 60 82 94

9. Part B Kinetic Energy, Potential, Energy and Heat
What is Kinetic energy? Energy of motion
What is potential energy? Energy of position
How does the kinetic energy of the clay change over time?
How does the potential energy of the clay change over time?
How was the kinetic transformed to potential?
How was the kinetic transformed to heat and how?
Create you own example of the 3 changes and record

10. Energy Units Part C Force: 1 Newton= .225lbs=1 J(joule/meter)
Work= Force X Distance
Power Work/Time

11. Energy Units Part C 1. A Make a concept map of the table 2.a
Do you think you can produce power equal to that of a 100-W bulb?
Calculate the power of a steel ball that weighs 5lbs.
3. Work(joules)= force(Newtons)X distance(meters)
Work to lift the 5lbs ball 2 meters
4. Power(watts)= work(J)/time(s)
Power to by lifting the ball 10 times in one minute

12. 2a:Force 5lb X(1N/0.225lb) = 22.22N 3a
Work=FXD Work = 22.22N X 2X2meters =88.88J
4a :
Power= W/t
(10 X 88.88J)/60s= 14.8 Watts
100watts? 40 X 89J/120s =29.6 watts
40X (22.22N X12meters)/120s=88.8 Watts

13. 2a: 5lb X(1N/0.225lb) =22.22 N Work=FXD 3a : 22.22N X 2m=44.44J
Make a concept map of the table
2.a
Do you think you can produce power equal to that of a 100-W bulb?
Calculate the power of a steel ball that weighs 5lbs.
3. Work(joules)= force(Newtons)X distance(meters)
Work to lift the 5lbs ball 2 meters
4. Power(watts)= work(J)/time(s)
Power to by lifting the ball 10 times in one minute
2a: 5lb X(1N/0.225lb) =22.22 N
Work=FXD
3a : 22.22N X 2m=44.44J
Power= W/t
4a : (10 X 44.44J)/60s

14. Warm-up” What happens as you move your hand closer to a heat lamp
Warm-up” What happens as you move your hand closer to a heat lamp?   What happens if you put a piece of paper in between your hand and the heat lamp?     I made a pot of steaming hot chocolate and poured it into a metal cup and a styrofoam cup, which cup will keep my hot chocolate hotter?

15. In the diagram below at what distance in meters is the highest potential energy?____________
Power____ (a) = mass X acceleration (in Newtons)
Force____ (b)= force X distance (in Joules)
Work____ (c) = W/t (in Watts)

16. Calculation
Calculate the power when you lift a 5 lb Ball 10 times 5 meters in 100 seconds? (1N= .225 lbs)
Force = 5 lb X 1N/.225 lbs =22.22 N
Work = Force X Distance; 22.22N X 10(2X5meters)= Joules
Power = Work/time; Joules/ 100s = watts

17. Digging Deeper Heat Transfer
Atoms and the speed of their electrons
As you increase heat you increase the movement(vibrations) of electrons and visa versa when you decrease. But when atoms get to absolute -2730C that would be the only time they would stop moving
In the hot water activity Monday which cup was the conductor and which was the thermal insulator?
Conductor= metal cup, insulator = Styrofoam cup, Conduction is one form of heat transfer.

18. Digging Deeper Heat Transfer
Another heat transfer is when hot air/water rises and cooler air/water falls that is called?
Convection

19. Digging Deeper Heat Transfer
Xrays, Sun, TV waves, etc is another form of heat radiation is called?
Electromagnetic radiation
3 forms of heat transfer is ?
1 Conduction
2 Convection
3 Electromagnetic radiation

20. Energy
4 forms of energy?
Kinetic energy: energy of motion, when the clay went up.
Potential energy: energy of position, when the clay got to max height
Chemical energy: breaking chemical bonds, burning wood
Mechanical energy: energy of work, when the you throw the clay up Work

21. Friction
Friction:
rubbing of hands
the clay hitting the table? How?

22. Work and Power
Work?
The force you put on a object and the distance that object goes
Work = Force X Distance, Joules and BTU
BTU: Raising the temperature of a pound of water one degree Fahrenheit
Power?
A Rate! Work done over time
Power = Work/time; Watts Joules/s, Horsepower ft-lbs/s

23. Friction
Friction:
rubbing of hands
the clay hitting the table? How?

24. Converting Heat into mechanical energy
How we make electricity
Coal, natural gas, petroleum
Break the chemical bonds to create heat
Use the heat to boil water in closed container to produce steam.
Steam builds to produce pressure that exerts force on a turbine.

25. Converting Heat into mechanical energy
Converting mechanical energy is not 100%, can you think of ways energy is lost. Think about the 2 cups of hot water
Heat loss, friction. Car engine: friction, not all the fuel is burned.
% Efficiency = Work in/Work out X 100
Electrical power plant turbines 30% efficient, Wind power turbines %, hydropower turbines 80%

26. Summary

27. Goals Describe heat transfer by conduction, convection, and radiation
Describe conversion of mechanical energy into heat
Describe the second law of thermodynamics and how it relates to electricity