good morning! 9/9/2014
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Good Morning! 9/9/2014. Starter: What speed do all Electromagnetic waves travel at? Today we will be taking our test on Waves: Sound & Light. Please take out your review and study. The test is 40 questions all multiple choice - PowerPoint PPT PresentationTRANSCRIPT
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Good Morning! Good Morning! 04/24/2304/24/23 Starter: What speed do all Starter: What speed do all
Electromagnetic waves travel at?Electromagnetic waves travel at? Today we will be taking our test on Today we will be taking our test on
Waves: Sound & Light.Waves: Sound & Light. Please take out your review and study.Please take out your review and study. The test is 40 questions all multiple The test is 40 questions all multiple
choicechoice We will be using scantron sheets and you We will be using scantron sheets and you
will need a #2 pencil (all 0.7mm will need a #2 pencil (all 0.7mm mechanical pencils will work for this)mechanical pencils will work for this)
Write your name, Waves Test for the Write your name, Waves Test for the subject and the period.subject and the period.
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The EssayThe Essay Please explain why a moving object Please explain why a moving object
will create a higher frequency sound will create a higher frequency sound as it comes towards you and a lower as it comes towards you and a lower frequency sound as it is going away.frequency sound as it is going away.
Answer this in paragraph form.Answer this in paragraph form.
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Good Morning! Good Morning! 04/24/2304/24/23
Starter Why do you get shocked Starter Why do you get shocked when you touch metal?when you touch metal?
Today we will be learning about Today we will be learning about moving electrons and starting moving electrons and starting our unit on electricity.our unit on electricity.
Answer: It is the moving of Answer: It is the moving of electrons.electrons.
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Charge!Charge!(the electrical (the electrical
kind)kind)
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How do things get How do things get a charge?a charge?
Charge is created by Charge is created by an imbalance of an imbalance of electrons.electrons.
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Why is it that electrons Why is it that electrons move and protons don’t?move and protons don’t?
Protons are located in the Protons are located in the nucleus of an atom (you’ll hear nucleus of an atom (you’ll hear more about this in Physical more about this in Physical Science B) Science B)
Electrons float around the Electrons float around the nucleus and are free to leave.nucleus and are free to leave.
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What What happens happens
when when you you
bring bring like like
charges charges togethertogether
??
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What What happens happens when you when you bring bring unlike unlike charges charges together?together?
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Why does that Why does that happen?happen?
Each charged object is Each charged object is creating a electric field.creating a electric field.
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What is an electric What is an electric field?field?
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What happens when What happens when you bring two you bring two electric fields electric fields
together?together?
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Why do you get a shock Why do you get a shock from door knobs?from door knobs?
It has to do with a build up of It has to do with a build up of electrons but it is more electrons but it is more complex than that.complex than that.
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Now that you know a Now that you know a little bit about charge little bit about charge
let’s apply that let’s apply that knowledge to some knowledge to some
questions you’ve had for questions you’ve had for a while.a while.
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Static Static ElectricityElectricity
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Why do Why do you get you get a shock a shock when when you you touch a touch a door door knob?knob?
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When When you walk you walk across across the floor the floor you you scrap scrap electrons electrons from the from the carpet.carpet.
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The The Electrons Electrons are are transferretransferred to the d to the feet and feet and throughouthroughout the body.t the body.
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When your When your finger finger approaches approaches the doorknob the doorknob the electrons the electrons move away move away and leave a and leave a positive positive charge.charge.Then the electrons
jump and give you a shock
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Why do balloons stick Why do balloons stick to walls after you rub to walls after you rub them on your head?them on your head?
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An un-An un-chargecharged d ballooballoon does n does not not attract attract hair.hair.
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The The electrons electrons
on the on the balloon balloon
repel the repel the electrons in electrons in
the wall, the wall, leaving a leaving a positive positive
charge and charge and an an
attraction attraction forceforce
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Now for some fun Who Now for some fun Who wants to get shocked?wants to get shocked?
First the First the VideoVideo Shock studentsShock students Let’s get some hair in the airLet’s get some hair in the air Magical Gedi Mind TrickMagical Gedi Mind Trick Light SaberLight Saber
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How does a Van De Graff How does a Van De Graff generator work?generator work?
It pulls It pulls electrons off electrons off of the metal of the metal sphere and sphere and anyone who anyone who who who touches it.touches it.
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Why does your hair Why does your hair stand straight up when stand straight up when you touch the Van De you touch the Van De
Graff Generator?Graff Generator?The hair is positive because The hair is positive because
the electrons have been the electrons have been pulled off of it. The charged pulled off of it. The charged hair is simply trying to get hair is simply trying to get as far apart as possible as far apart as possible because like charges repel.because like charges repel.