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

Resistance

Homework re-read chapter 16 upto to activity 16A and then complete the activity. Check out this webpage about resistance:
http://hyperphysics.phy-astr.gsu.edu/Hbase/electric/resis.html#c1

New Topic Electricity

At last the Mechanics topic is over. This is the biggest topic in terms of content and although the topic test is behind us please don't forget what we have learnt. It is important to review some of the mechanics section every week as the year goes on so that when the final exams come up it is not just a distant memory.

Our next topic is electricity and we start with the idea of the electric field. The following two links are a good place to follow up what we talked about in class this morning.
http://www.colorado.edu/physics/2000/waves_particles/wavpart3.html
http://hyperphysics.phy-astr.gsu.edu/Hbase/hframe.html

Explain that concept

We are getting close to the common test. One last thing to prepare for is the explain questions that are definitely going to be part of the test.

The following link is to a document of explain questions.



Explain Questions

Re-arranging equations

What would it be like If you had your own pet teacher ?

• who could show you how to re-arrange equations and
• do it over and over again until you got it
• and the teacher would never get tired
• never get bossy
• never tell you off for not paying attention

Well get real folks, teachers like that do not exist, but youtube videos do. 

The following links lead to a couple of simple demos on re-arranging equations. By the look of things there are heaps more if these don't do it for you.

1. Re- arranging equations using Physics examples   
2. Re-arranging equations maths examples

 

here are some static pages if your internet connection is slower

 

1. Algebra instructions from Massey University
2. A pdf file on re-arranging equations

 

 

 

 

Energy and combined mechanics

We've spent the last couple of spells carrying out some "serious" research into:

• spring constant
• elastic potential energy
• energy transfer
• projectile motion

It has been a real life combined mechanics problem using rubber bands, retard stands, force meters and folded up pieces of paper. Luckily no lasting injuries were sustained but it became apparent that some work needs to be done on re-arranging equations.

 

The homework sheet for the weekend on "Kinematics, Momentum and Energy" should give you some more practice.

 

Happy Physics   

Tutorial

Monday lunchtime in room B5. If you have any questions about what we've been doing in class or need to figure out what it was I was trying to explain to the class come along to B5 on Monday.

Energy

This weekend  your homework is to finish the all activities from the handout you recieved on Thursday. Energy is in part, a revision topic from the year Eleven science course. So make sure you are confident with all these problems.

Moving in Circles

Your homework is to complete the activity 12A on page 143 of our Physics text book.

 

Next spell we begin our final topic "Energy".