1. Agenda Bell Work
Notes: Intro to Thermal • What is the
Energy difference between
a hot cup of coffee
and a cold cup of
Temperature Scale coffee?
Reseach
- List everything you
HW: Chp 9 pg 135- can think of.
136, 138-139, 144-
147
2. • What is the difference between a hot cup
of coffee and a cold cup of coffee?
- List everything you can think of.
4. Objectives
1. Explain the motion of molecules in the
different states of matter
2. Understand the definition of thermal
energy
3. Describe what happens in thermal
equilibrium
5. Movement of atoms
• All matter is constantly moving
• Moving particles determines whether an
object is solid, liquid, or gas
6. Kinetic Energy
• The warmer an object is the more kinetic
energy it has
= more thermal energy
8. Hot or Cold
• Temperature
• Thermometer measures temperature by
expansion or contraction of a liquid
Eureka 20
9. Temperature
• Related to the random motion
of atoms and molecules
• average kinetic energy of
molecules
10. • Thermometers read their own temperature
• Energy flows between the thermometer
and the object until they reach an equal
temperature
• This equilibrium is called a Thermal
equilibrium
11. Flow of Thermal Energy
• From a warmer substance to a colder
one
• HEAT – thermal energy in motion
12. What’s cold?
• The absence of thermal energy
• An object is cold because of the loss
in thermal energy
• Eureka 21
13. Heat
• Measured in Joules
• 4.2 Joules of heat to change 1 gram
of water 1 Celsius degree
14. c alorie
• Unit of heat used in the United States
• Amount of heat needed to change 1
gram of water 1 Celsius degree
• 1 c alorie = 4.2 joules
15. • Energy ratings of food and fuels are
measured by the energy released
when they are burned
• Kilo calories = C alories we know on
food packages (capitol C)
16. • To the Weight Watcher, the peanut
contains 10 C alories
• To the physicist, it releases 10,000
c alories of energy when burned or
digested
