Study Hall: Welcome Back! Sharpen your pencils…. Find your seat…… Work on something quietly at...
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Transcript of Study Hall: Welcome Back! Sharpen your pencils…. Find your seat…… Work on something quietly at...
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Study Hall: Welcome Back!
Sharpen your pencils….Find your seat……
Work on something quietly at your desk…
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Warm Up – List 5 ways you…. • Used electrical energy over break.
• Used mechanical energy over break.
• You should have 10 total!
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Volunteers to share with the Class?
• Electrical Energy:
• Mechanical Energy:
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Announcement• There will be MAP testing tomorrow
during your 1st and 2nd block class.• Discovery Place (Any parents want to
come?)• Notebook check for those who did
not get a grade last Friday
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Science Fair• Science Fair form signed today.• Hand your proposed science Fair Question to
me on Wednesday.• This is your homework.• Remember-
Is your question testable?Can you afford the materials?Are there variables included?
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Our mission this week is to…
• To be an expert on conductors and insulators.
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Interactive Notebook Q2
• Add entry to Table of Contents• 6.P.3.3 Insulators and Conductors• Assign the next number
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Interactive Notebook Q2
• Label Next Available Page: • 6.P.3.3 Insulators and Conductors• Number page to match Table of
Contents entry• Circle the number
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Write this in your notebook
• Electrical energy can also pass through conductors.
• An electrical conductor is a material through which an electrical current can flow easily.
• Includes most metals
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Examples of Electrical Conductors….
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Write this in your notebook….
• An electrical insulator is a material through which electrical current does not easily flow.
• Includes rubber, glass, porcelain, ceramic, plastics
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Examples of Electrical Insulators….
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Let’s test what’s an electrical conductor or insulator!• Copy chart in your notebook:
“Our Conduction & Insulator Experiment”• “Object Hypothesis
(Conductor/InsulatorResult
(Conductor/Insulator)
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Write this in your notebook….
• Thermal energy is transferred through a material by the collisions of atoms within the material.
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Remember Thermal Energy? Think about the Atoms….
• Copy this into notebook• How do atoms move when they gain heat
energy (states of matter changes)? • They expand, spread & bump into one
another• This allows the heat to move!
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Remember???
• Over time, thermal energy (heat) spreads out through materials because of the atoms:
–It can travel by conduction (2 or more materials in direct contact with one another)
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• It can travel by convection (currents in air, water and other fluids)
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• It can travel by radiation ( when heat is transferred over
space in electromagnetic waves)
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Write this in your notebook….
• Thermal energy can warm objects Examples: the inside of a car sitting in the sun
with the windows closed, and a cup of boiling water.
• Materials will cool down over time if thermal energy is not striking it.
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Examples of Thermal Energy
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Write this in your notebook….
• Some materials we use easily conduct heat• Includes metals (aluminum, steel, and copper)• We call these materials thermal conductors
because they transfer heat and they hold heat easily too.
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Thermal insulators
• http://www.youtube.com/watch?v=43xcvSSFFxc
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Think about cookware….
• Most cookware is made from different types of metals because they are thermal conductors
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Write this in your notebook….
• Some materials we use do not conduct heat• Includes pot handles, spatulas, cooking
utensils• We call these materials thermal insulators
because they reduce (limit) heat transfer • They do not get hot as easily
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Think about cookware….
• Notice the handles on the cookware…..• The handles do not conduct heat because they
are thermal insulators
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Write this in your notebook….
• Expansion joint strips in bridges allow for the bridge to expand in hot weather and not break.
• These same joint strips allow for the bridge to contract in cold weather and not break.
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Examples of Expansion and Contraction Joints…
Bridge with expansion joints
Sidewalk with expansion joints
Road with no expansion joints….cracks over time with heating and cooling
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Demonstration…
• Could we make a bubble get bigger using a metal soda can or a plastic soda bottle?
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Demo Results….
• When we held the metal can, the heat was easily conducted (transferred) from our hands through the metal = metal is a thermal conductor!
• Our bubble grew larger!• When we held the plastic bottle, the heat was not
easily conducted (transferred) from our hands through the plastic = plastic is a thermal insulator!
• Our bubble did not grow larger!