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# Energy types notes 2010

## on Apr 09, 2010

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## Energy types notes 2010Presentation Transcript

• 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?
• 1. What is heat? 2. How does thermal energy play a role in the Law of Conservation of Energy?
• Bill Nye; Heat  BEFORE: List the forms of energy that you know and understand  DURING: Write notes about heat, conduction, convection, radiation  AFTER: Write a paragraph that describes thermal energy, heat, and the processes of conduction, convection, and radiation.
• Roller Coaster Energy Problems HT=250 m WT=200N HT=20 m WT=200N M=20kg V=200m/s 1. Find the PE at point A. 2. Find the KE at point A. Answer the 3. Find the ME at point A. problems on 4. Find the KE at point B. the left on your sheet under the 5. What is the ME at point C? roller coaster 6. Find the PE at point C. picture. 7. Find the KE at point C.
• 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.
• 1. Describe the energy transfers in a hairdryer. 2. What is the difference between renewable and nonrenewable energy resources?
• Forms Explanation Example Total energy of Mechanical motion and position Total kinetic energy Thermal of particles Energy stored in Chemical rearranging atoms
• Energy of moving Electrical electrons Energy of vibrating Sound particles Vibrations of electrically Light charged particles Energy in the nucleus of Nuclear an atom
• 1. Mechanical Energy total energy of motion and position ME=KE + PE
• An object on the top of a hill has high ____ energy and low ____ energy. As the object rolls down, what happens? Why does there seem to be less energy at the bottom of the hill than at the top?
• 2. Electrical Energy the energy of moving electrons Like charges repel and + + Opposite charges attract + -
• Two Types of Electricity Static Electricity Current Electricity
• The Power of Electricity  Can be turned into other kinds of energy  Can do work  Hairdryer converts electric to thermal  Alarm clock converts electric to sound and light
• 3. Nuclear Energy the energy of the nucleus of an atom  Fission  Fusion
• Pros and Cons of Nuclear Energy Fission Fusion + make electrical + fuel is plentiful energy + only small amounts + no carbon dioxide or of radioactive waste other gases products - limited fuel supply - not currently - radioactive waste practical products - large amount of - possible release of energy needed to radioactive material heat and contain the hydrogen plasma
• The Sun Giant nuclear fusion reactor Ultimate source of energy for our planet
• 4. Chemical Energy the energy of rearranging atoms  Is photosynthesis endothermic or exothermic?  Is respiration endothermic or exothermic?
• 5. Sound Energy the energy of vibrating particles -caused by vibrations & carried through a substance.
• Making Sound vs. Hearing Sound Have you heard this riddle? If a tree falls in the forest and no one is around to hear it, does the tree make a sound? 0 What do you think?
• When a tree falls and hits the ground, the tree and the ground vibrate. These vibrations are transferred to the surrounding air. 0 So there would be a sound!!!
• Change Frequency = Change Pitch TRY IT! – Vocal cords WATCH IT! – Jars vs. Bottles
• TRY IT!  Hold the cut rubber band stretched tight.  Have a partner pluck the rubber band with their finger.  Notice the pitch.  Shorten the length of rubber band by holding it in the middle.  What was different??
• Echolocation
• 6. Light Energy the vibrations of electrically charged particles Called PHOTONS 
• The EM Spectrum  Visible 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
• Possibilities of Light Light rays move away from their source in straight lines. When they hit something, they are either Absorbed Reflected Refracted (stopped) (bounced off) (bent) WATCH IT! - Mirror
• TRY IT!  Fill beaker half full of water.  Put a pencil in the glass.  Look at the pencil through the side of the glass.  How does the pencil look different than it did before you put it in the water?  This is an example of ______________.
• TRY IT!  Prop up the card with the arrow on it.  Place a glass of water a little to one side of the card and a few inches in front of it.  Now stoop down until your eyes are level with arrow.  Slide the glass between the card and your eyes. Try sliding it back and forth a few times.  What happened? What causes this?
• Light Source or Not? You can see a light source even in the dark because its light passes directly into your eyes. Most things around you are not light sources. Why can you still see them? You can still see them because light from light sources reflects off the objects and then travels to your eyes.