Download Kinetic energy - dr. stephen alfred

WARM UP
1. What is the independent variable”
2. What is the dependent variable?
3. What is the relationship between the # of pizza toppings and cost
of the pizza?
4. How much does a pizza with 3 toppings cost?
5. **MATH** What is the slope of this line?
ENERGY
• Energy is the ability to do work.
•Work is a transfer of energy.
• Energy and work are expressed in units
of joules (J).
THE TWO MAIN FORMS OF ENERGY ARE:

Kinetic energy- the
energy of motion.

Potential energystored energy that can be
put into future use
THE TWO MAIN FORMS OF ENERGY ARE:

Kinetic energy




Electromagnetic (light)
Thermal (heat)
Sound
Electrical
Mechanical (motion)

Potential energy


Chemical
Nuclear
mechanical (position)
•
Mechanical energy is the total energy of motion and
position of an object.
•
mechanical energy  potential energy  kinetic energy


More mass and/or higher velocity = more KE
More mass and/or higher above the ground
(resting position) = more PE
22. USE THE DIAGRAM TO ANSWER THE
QUESTION BELOW.
Each ball has the same mass. Which ball has the
greatest potential energy?
a.
Ball A
b.
Ball B
c.
Ball C
d.
Ball D
• Thermal Energy is the energy of moving
molecules
•All matter has thermal energy
•Higher temperature = more KE
http://www.youtube.com/watch?v=te7aFC8DTls
 http://phet.colorado.edu/en/simulation/states-ofmatter-basics

• Electrical Energy - the energy of
moving electrons.

Sound Energy – moves through vibration of matter
Travels in waves
 MUST have matter to travel through

SEEING SOUND WAVES

http://www.youtube.com/watch?v=DPUlss0_Lkk
• Electromagnetic Energy is produced by
the vibrations of electrically charged
particles.
•Travels in waves
•Does NOT need matter to travel
•Examples: light, x-rays, microwaves
COMPARE/CONTRAST: LIGHT AND SOUND
Light
Doesn’t need
matter to travel
Sound
Kinetic energy
Travel in waves
Happen because
particles vibrate
Needs matter
to travel
•Chemical Energy –stored in bonds between atoms
•
Examples: food, fuel, batteries
• Nuclear Energy – stored in nucleus
of an atom
• Fusion- nuclei join
• Fission- nucleus is split
• Example: sun creates light/heat through fusion of
hydrogen nuclei into helium

http://phet.colorado.edu/en/simulation/nuclearfission
What
type of
energy?
What
type of
energy?
WHY?
KINETIC ENERGY
ELECTROMAGNETIC
ENERGY
What
type of
energy?
What
type of
energy?
KINETIC ENERGY
ELECTRICAL
ENERGY
HEAT FROM A TOASTER
HEAT FROM A TOASTER
KINETIC ENERGY
THERMAL
ENERGY
RING FROM A CELL PHONE
RING FROM A CELL PHONE
KINETIC ENERGY
SOUND
(
(
((
((
ENERGY
LUMP OF COAL
LUMP OF COAL
POTENTIAL
ENERGY
CHEMICAL
ENERGY
MOVING BUS
MOVING BUS
KINETIC ENERGY
MOVING
MECHANICAL
ENERGY
LAW OF CONSERVATION OF
ENERGY
Energy cannot be
created or destroyed
only transferred
from one form to
another
1. BALL ROLLING DOWN A HILL
From:
To:
BALL ROLLING DOWN A HILL
From:
To:
2. LIGHT BULB
From:
To:
LIGHT BULB
From:
Electrical
Energy
To:
Electromagnetic
Energy
KINETIC ENERGY
KINETIC ENERGY
ELECTRICAL
ELECTROMAGNETIC
ENERGY
ENERGY
3. ELECTRIC OVEN
From:
To:
ELECTRIC OVEN
From: Electricity
To: Heat
KINETIC ENERGY
KINETIC ENERGY
ELECTRICAL
THERMAL
ENERGY
ENERGY
4. BATTERY POWERED FLASHLIGHT
From:
To:
BATTERY POWERED FLASHLIGHT
From:
Chemical Energy
POTENTIAL
ENERGY
CHEMICAL
ENERGY
To:
Electromagnetic
Energy
KINETIC ENERGY
ELECTROMAGNETIC
ENERGY
6. TREE
From:
To:
TREE
From:
Sunlight
KINETIC ENERGY
To:
Wood
POTENTIAL
ENERGY
ELECTROMAGNETIC
CHEMICAL
ENERGY
ENERGY
7. Ipod
From:
To:
Ipod
From:
Batteries
To:
Sound
POTENTIAL
ENERGY
KINETIC ENERGY
CHEMICAL
SOUND
(
ENERGY
(
((
((
ENERGY
8. SOLAR PANELS
From:
To:
SOLAR PANELS
From:
Light
To:
Electricity
KINETIC ENERGY
KINETIC ENERGY
ELECTROMAGNETIC
ELECTRICAL
ENERGY
ENERGY
6. NUCLEAR POWER PLANT
From:
To:
NUCLEAR POWER PLANT
From:
Nuclear
Fission
To:
Electricity
POTENTIAL ENERGY
KINETIC ENERGY
NUCLEAR
ELECTRICAL
ENERGY
ENERGY
7. WIND FARM
From:
To:
WIND FARM
From:
Movement
To:
Electricity
KINETIC ENERGY
KINETIC ENERGY
MOVING
MECHANICAL
ELECTRICAL
ENERGY
ENERGY
8. DAM (HYDROELECTRIC PLANT)
From:
To:
DAM (HYDROELECTRIC PLANT)
Input:
Moving
Mechanical
Energy
Output:
Electricity
KINETIC ENERGY
KINETIC ENERGY
MOVING
MECHANICAL
ELECTRICAL
ENERGY
ENERGY
9. TV
From:
To:
TV
To:
Sound and light
From:
electricity
POTENTIAL
ENERGY
KINETIC ENERGY
KINETIC ENERGY
ELECTROMAGNETIC
SOUND
ENERGY
(
(
((
((
CHEMICAL
ENERGY
ENERGY
11. FIRE
From:
To:
FIRE
To:
Heat And Light
From:
Wood
POTENTIAL
ENERGY
KINETIC ENERGY
KINETIC ENERGY
ELECTROMAGNETIC
CHEMICAL
THERMAL
ENERGY
ENERGY
ENERGY
12. THE SUN
From:
To:
THE SUN
From:
Nuclear Fusion
POTENTIAL ENERGY
NUCLEAR
ENERGY
To:
Heat And Light
KINETIC ENERGY
KINETIC ENERGY
ELECTROMAGNETIC
THERMAL
ENERGY ENERGY
13. CAR
From:
To:
CAR
To:
From:
Gas
KINETIC
ENERGY
POTENTIAL
ENERGY
ELECTRO
MAGNETIC
ENERGY
ENERGY
(
((
(
KINETIC
ENERGY
((
CHEMICAL
SOUND
KINETIC
ENERGY
ENERGY
MOVING
MECHANICAL
ENERGY
EXIT SLIP
1. Jose ate a turkey sandwich and an apple for lunch. Later that day,
he ran 2 miles during soccer practice. Which of the following energy
transformations occurred between lunchtime and the end of Joes’s
run?
a)
Thermal energy was converted to kinetic energy.
b)
Kinetic energy was converted to chemical energy.
c)
Electrical energy was converted to thermal energy.
d)
Chemical energy was converted to mechanical energy.
2. What kind of energy transformation happens in a television?
a)
Light is transformed into electrical energy
b)
Electrical energy is transformed into chemical energy.
c)
Electrical energy is transformed into light energy.
d)
Chemical energy is transformed into light energy.
EXIT SLIP
3. What kind of energy transformation happens when a
person rides a bike down a hill?
a) Light energy is transformed into chemical energy.
b) Electrical energy is transformed into kinetic energy.
c) Potential energy is transformed into kinetic energy.
d) Kinetic energy is transformed into potential energy.
4. What kind of energy transformation happens when
firewood it lit in a campfire?
a)
Light energy is transformed into chemical energy.
b)
Chemical energy is transformed into thermal energy.
c)
Potential energy is transformed into kinetic energy.
d)
Kinetic energy is transformed into potential energy.
EXIT SLIP
5. What king of energy transformation occurs when you eat food and
then do jumping jacks?
a)
Light is transformed into chemical energy.
b)
Electrical energy is transformed into chemical energy.
c)
Chemical energy is transformed into mechanical.
d)
Potential energy is transformed into Chemical energy.