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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

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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

  • We will be using scantron sheets and you will need a #2 pencil (all 0.7mm mechanical pencils will work for this)

  • Write your name, Waves Test for the subject and the period.


The Essay

  • Please explain why a moving object will create a higher frequency sound as it comes towards you and a lower frequency sound as it is going away.

  • Answer this in paragraph form.


Good Morning! 9/9/2014

  • Starter Why do you get shocked when you touch metal?

  • Today we will be learning about moving electrons and starting our unit on electricity.

  • Answer: It is the moving of electrons.


Charge!(the electrical kind)


How do things get a charge?

  • Charge is created by an imbalance of electrons.


Why is it that electrons move and protons don’t?

  • Protons are located in the nucleus of an atom (you’ll hear more about this in Physical Science B)

  • Electrons float around the nucleus and are free to leave.


What happens when you bring like charges together?


  • What happens when you bring unlike charges together?


Why does that happen?

  • Each charged object is creating a electric field.


What is an electric field?


What happens when you bring two electric fields together?


Why do you get a shock from door knobs?

  • It has to do with a build up of electrons but it is more complex than that.


Now that you know a little bit about charge let’s apply that knowledge to some questions you’ve had for a while.


Static Electricity


  • Why do you get a shock when you touch a door knob?


  • When you walk across the floor you scrap electrons from the carpet.


  • The Electrons are transferred to the feet and throughout the body.


When your finger approaches the doorknob the electrons move away and leave a positive charge.

Then the electrons

jump and give you a shock


Why do balloons stick to walls after you rub them on your head?


  • An un-charged balloon does not attract hair.


The electrons on the balloon repel the electrons in the wall, leaving a positive charge and an attraction force


Now for some fun Who wants to get shocked?

  • First the Video

  • Shock students

  • Let’s get some hair in the air

  • Magical Gedi Mind Trick

  • Light Saber


How does a Van De Graff generator work?

  • It pulls electrons off of the metal sphere and anyone who who touches it.


Why does your hair stand straight up when you touch the Van De Graff Generator?

  • The hair is positive because the electrons have been pulled off of it. The charged hair is simply trying to get as far apart as possible because like charges repel.


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