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

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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.

### 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.

### 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.

### 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.

### 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.