types of energy notes
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Wt=50N
1. What is the KE at point A? Why?2. What is the PE at point A?3. What is the ME at point A?4. What is the height at point B?5. What is the height at point C?
A.
B.C.
WARM UP
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Warm up…
1. What is heat?
2.How does thermal energy play a role in the Law of Conservation of Energy?
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Roller Coaster Energy Problems
1. Find the PE at point A.2. Find the KE at point A.3. Find the ME at point A.4. Find the KE at point B.5. What is the ME at point C?6. Find the PE at point C.7. Find the KE at point C.
HT=250 mWT=200N
HT=20 mWT=200NM=20kg
V=200m/s
Answer the problems on the left on your sheet under the
roller coaster picture.
A.
B.C.
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Warm up…
1. Describe the energy transfers that occur in a light bulb.
2. Describe the energy transfers that occur when the body is
powered by food.
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Warm up…
1.Describe the energy transfers in a hairdryer.
2.What is the difference between renewable and
nonrenewable energy resources?
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Types of EnergyForms Explanation Example
MechanicalTotal energy of
motion and position
ThermalTotal kinetic energy
of particles
ChemicalEnergy stored in
rearranging atoms
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Types of EnergyElectrical
Energy of moving electrons
SoundEnergy of vibrating
particles
LightVibrations of electrically
charged particles
NuclearEnergy in the nucleus of
an atom
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1. Mechanical Energytotal energy of motion and position
ME=KE + PE
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2. Electrical Energythe energy of moving electrons
Like charges repel and
Opposite charges attract
++
+ -
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The Power of ElectricityCan be turned into other kinds of energyCan do work
Hairdryer converts electric to thermalAlarm clock converts electric to sound and
light
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3. Nuclear Energy
Fission Fusion
the energy of the nucleus of an atom
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The Sun
Giant nuclear fusion reactor
Ultimate source of energy for our planet
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4. Chemical Energythe energy of rearranging atoms
Is photosynthesis endothermic or exothermic?
Is respiration endothermic or exothermic?
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5. Sound Energy
-caused by vibrations & carried through a substance.
the energy of vibrating particles
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6. Light Energythe vibrations of electrically charged particles
Called PHOTONS
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The EM SpectrumVisible light is one portion of
the Electromagnetic Spectrum.
All of these waves are energy-filled waves.
Insects, like bees, see shorter wavelengths than humans. What type of EM waves do they see?
WATCH IT! - prism
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Possibilities of LightLight rays move away from their source in straight lines.
When they hit something, they are either
Reflected(bounced off)
Refracted(bent)
Absorbed(stopped)
WATCH IT! - Mirror
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Sound & Light: Alike, but Different
Sound*vibration*needs a medium
*longitudinal
Light
*does NOT need a
medium*transverse
Both
are
WAVES
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7. Thermal Energy
more thermal energy = faster moving particles
less thermal energy = slower moving particles
the total kinetic energy of the particles
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Thermal Energy vs. HeatHeat is the transfer of energy between objects that are at different temperatures.
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Three Kinds of HeatConduction Convection
Radiation
(touch) (current) (rays)
Hot Cold
Common