Download 8.9 Types of Energy Wednesday, February 3rd, 2016, EQ#12 Block

8.9 Types of Energy
Wednesday, February 3rd, 2016, EQ#12 Block#1
EQ: What is the difference among Thermal Energy, Heat, and Temperature?
Thermal energy: the total kinetic energy of all the moving particles in an object
Temperature: the average kinetic energy of all the moving particles in an object
Heat: the transfer of thermal energy from one object to another object
AA: A ball with a mass of 4 kg rolls across the floor with a speed of 4 m/s. A) Find KE. Now the ball
doubles its speed. B) What is the new KE?
KE = 1/2mv2
KE = ½ x 4 x 42
KE = 32 [J]
KE = 1/2mv2
KE = ½ x 4 x 82
KE = 2 x 64
KE = 128 [J]
Potential Energy: Energy that is stored for use at a later time
1. Gravitational PE


Energy that is stored by raising objects to a higher height
Example: a can on a shelf, a roller coaster at the top of a hill
2. Chemical PE


Energy that is stored at the molecule level
Example: food, gasoline, wood, and plants
3. Electrical PE


Energy stored in the collection of like charges
Example: a battery, clouds in a thunderstorm
4. Nuclear PE

Energy that is stored inside the nucleus of an atom

Example: nuclear bomb, nuclear power plant
5. Elastic PE


Energy that is stored in stretching or compressing things
Examples: hair tie, rubber band, spring, sneakers
Kinetic Energy: the energy of motion
1. Mechanical KE


When one moving object causes a second object to move
Example: hammer and nail, screw and screwdriver
2. Acoustic KE


Motion of molecules bumping into other molecules carrying sound
Example: anything that makes sound
3. Electrical KE


The energy of charge in motion
Example: electricity, lightening
4. Radiant KE



The movement of light and radiation
Light is a form of radiation
Example: radio, infrared, visible, ultraviolet (UV), X-rays, and gamma rays
5. Thermal KE




The movement and collision of atoms in an object
Thermal energy: the total kinetic energy of all the moving particles in an object
Temperature: the average kinetic energy of all the moving particles in an object
Heat: the transfer of thermal energy from one object to another object
Conservation of Energy Law:
Allowed to do:
A. Transform energy into a different type of energy
B. Transfer energy from one object to another object
Cannot do:
A. Create new energy
B. Destroy energy
*Total amount of energy in the universe is constant!
Thursday, February 4th, 2016, EQ#12 Block#2
EQ: What two things can you do and can you not do according to the Conservation of Energy
Law?
Allowed to do:
Transform energy into a different type of energy
Transfer energy from one object to another object
Cannot do:
Create new energy
Destroy energy
AA: What is the difference between chemical PE and nuclear PE? Which one has more
energy?
Chemical PE is store at the molecule level and nuclear PE is stored in the nucleus of an atom.
The nuclear PE has more energy.