energy grade/energy/energy.… · energy •energy –the ability to do work or cause change...
TRANSCRIPT
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ENERGY
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WHAT IS ENERGY?
What does energy mean to you?
http://www.pbslearningmedia.org/resource/nvel.sci.phy.defined/energy-defined/
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ENERGY
• Energy – The ability to do work or cause change
• Produce warmth, light, sound, movement, growth…
• Is neither created nor destroyed
• Just transformed or converted from one form to another
• Potential Energy – Stored energy
• Kinetic Energy – Energy of motion
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POTENTIAL ENERGY
• Energy of position
• Water behind a dam
• Hammer over a nail
• Cup on the edge of the countertop
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KINETIC ENERGY
• Energy of motion
• The form capable of doing work
• Flowing water
• A falling hammer
• The cup falling
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FORMS OF ENERGY
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FORMS OF ENERGY
1. Mechanical Energy
2. Thermal (heat) Energy
3. Electromagnetic Energy
4. Electrical Energy
5. Nuclear Energy
6. Chemical Energy
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1. MECHANICAL ENERGY
• Energy associated with the motion of an object
• Cars moving down a road
• A frog dancing on a lily pad
• A bowling ball hitting pins
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2. THERMAL ENERGY
• Heat energy
• The heat energy of an object determines
how active its atoms are
• Hot objects have rapidly moving atoms
• Cooler objects have slow atoms
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3. ELECTROMAGNETIC ENERGY
• Energy that travels in waves
• Gamma rays
• X-rays
• UV rays
• Visible light
• Infrared rays
• Microwaves
• Radio bands
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4. ELECTRICAL ENERGY
• Energy caused by the movement of electrons
• Static shock
• Lightening
• Computers / TVs / radios
• Light bulbs
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5. NUCLEAR ENERGY
• Energy stored in the nucleus of an atom
• Stars
• Nuclear power plants
• Nuclear bombs
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6. CHEMICAL ENERGY
• Potential energy stored in a chemical bond
• Food
• Fire cracker
• Stomach
• Battery
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ENERGY TRANSFERRED
• Energy is neither created nor destroyed, only changed
• Law of Conservation of Energy
• First Law of Thermodynamics
• No energy transfer is 100% efficient so some energy is lost to the environment
but that does not mean it was destroyed, just lost
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QUIZ TIME!
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NAME THE TRANSFER
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NAME THE TRANSFER
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Electrical energy is transported to your house through power lines.
When you plug an electric fan to a power outlet, electrical energy is transform into what type of energy?
MECHANICAL ENERGY
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What type of energy cooks
food in a microwave oven?
ELECTROMAGNETIC
ENERGY
What type of energy is the
spinning plate inside of a
microwave oven?
MECHANICAL ENERGY
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WHAT TYPES OF ENERGY ARE SHOWN BELOW?
Mechanical and Thermal Energy(Don’t forget friction)
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WHAT TYPE OF ENERGY IS SHOWN BELOW?
Chemical Energy
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WHAT TYPES OF ENERGY ARE SHOWN BELOW?
Electrical, Mechanical andElectromagnetic Energy
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YOUR TURN
• With your table, come up with a description of how mechanical energy could
be transformed to electrical energy.
• With your table, come up with a description of how electrical energy could be
transformed to thermal energy.