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# Good Morning! 9/9/2014 - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about ' Good Morning! 9/9/2014' - osgood

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Presentation Transcript
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.

• 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.

• 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)

• Charge is created by an imbalance of electrons.

• 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.

• Each charged object is creating a electric field.

• 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 that knowledge to some questions you’ve had for a while.

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

Then the electrons

jump and give you a shock

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? wall, leaving a positive charge and an attraction force

• 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? wall, leaving a positive charge and an attraction force

• 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.