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Only one week till exams. You know what you should be doing.

 

Images in mirrors and lenses

Again there are some resources on "You tube" for Ray diagrams.

 

Ray Diagram (Lens)

 

Images in plane mirrors

Tone Generator

Today in class we were playing with a tone generator program on a laptop. (I mean learning about sound waves)If you would like to down load the tone generator for yourself here is the link. Tone Generator Download site

Things to try
Play a single tone through some speakers and then walk slowly in front of the speakers listening for areas of constructive and destructive interference
Play two tones of slightly different frequency and create "Beats"
Drive your friends and family wild with disturbing noises
Have a good break and do some physics activities from your text books.

Practice Exams

It is a busy time coming up with the Senior Assessment fortnight starting on the 9th of September. You lucky year twelve physics students have several goals during this time.

 

Practice NCEA style assessments for the topics: 

• Mechanics
• Electricity and magnetism
• Atoms and radioactivity

Gain Credit in intenal assessments written examination

• Demonstrate understanding of Physics in an integrated context (3 Credits)

These will take place during the three hour exam on Thursday 11 September.

 

But wait there's more....

 

in another three hour session held in room B5 you will have the opportunity to gain further credit for:

• Take measurements of physical quantities and analyse data graphically to determine a relationship (4 credits)

The times for this assessment are  Thursday 11 September 8.45 and 11.35, Friday 12 September 8.45 and Monday 15 September at 8.45. Make sure you have booked into the session you can attend.

 

Beakman's Motor

On Friday we had fun making a working motor from some very simple items. Most of you managed to get yours to work. Don't forget to get all the activities done from chapter 17. Here is a picture of the motor we made and a link to a web page about the motor.

Beakman's Motor

Electro-magnetism

This week we have been refreshing our memories about magnetic fields around magnets and current carrying conductors. This diagram of the magnetic field associated with a Solenoid uses the "dart analogy" this time used to show direction of conventional current (positive to negative) in the wire.

 

I hope you've all done your homework or as our Brazilians might say "dever de casa". The homework of course was to finish activities 17a and 17b.

 

 

Electromagnetisim

Welcome back year 12 Physicists we are up to electromagnetism now.

Check out the link below for the real info about solenoids and their associated magnetic fields.

 

Magnetic field around a solenoid

Homework

Please complete today's hand out on circuit problems.

Homework

Activity 16 D. Please make sure you have done 16 A-C also. We need to move on to power in DC circuits next week.

Potential Divider

Potential dividers are also known as voltage dividers.The potential divider is a useful circuit for providing a voltage to a component that requires a smaller voltage than the supply voltage in a circuit.

Follow these links for some webpages about potential dividers.

 

Potential divider 1

 

Potential divider calculator

 

Potential divider 2